The Best 300BLK Barrel Length & All Things 300 Blackout Answered

What barrel length is best for 300BLK AR-15s? 300BLK vs. 5.56? 300BLK vs. 7.62x39? Best twist rate for 300 Blackout? Let's find out!
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Disclaimer: These videos are strictly for educational and entertainment purposes only. Imitation or the use of anything demonstrated in my videos is done AT YOUR OWN RISK. All work on firearms should be carried out by a licensed individual and all state and federal rules apply to such. We (including KZbin) will not be held liable for any injury to yourself or damage to your firearms resulting from attempting anything shown in any our videos. I do not endorse any specific product and this video is not an attempt to sell you a good or service. I am not a gun shop and DO NOT sell or deal in Firearms. Such a practice is heavily regulated and subject to applicable laws. I DO NOT sell parts, magazines, or firearms. These videos are free to watch and if anyone attempts to charge for this video notify us immediately. By viewing or flagging this video you are acknowledging the above.
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[@waynebaker8694]

3 years later and still one of the best videos on 300 blackout

[@Seasniffer1969]

Man it's crazy it's been 3 years now. Gosh where did the last 3 years go.. fudge..

[@dc-gs3ld]

when you see people bring up 300blk and compare it to 5.56 and 7.62 all of a sudden nobody is an adult anymore

[@phild9813]

I think all three are cool, and extremely effective with correct ammunition choices.

[@ElTejon47901]

A classic. Bought LWRCI M6 ICDI in .300 BO as deer rifle 2 months ago, but watched this first.

[@migl3098]

4 years later now and still 👍👍

[@briancampbell6921]

Yes, definitely do a 300BO vs 5.56 video. I think one or two of us will watch it.

[@frankz9103]

That would be great.

[@Laotzu.Goldbug]

I know you're half joking because this seems like a tired subject, but it's something that, at least in this very specific niche of short barrels, for short range, when using a suppressor but still supersonic ammo, I have a lot of questions about. I think if you really really want to optimize that you might go with something like 6.8 SPC in a 9 inch barrel, but if we're keeping with regular 5.56 brass and magazines, I'm torn between which caliber to keep next to my bed.

[@TacticalReview]

1 or 2... or all 331k subscribers.

[@SteveZ919]

...and gel test with their light home defense/varmit bullets (since most of us dont own suppressors)

[@johngibson7943]

Why'd you leave out distance

[@texas66]

CAUTION!!!! 300 BLK may cause excessive range time, satisfied grins, and long conversations with AK owners. :-D

[@tuongtran4862]

Gary Carroll And exploded ar15s chambered for 223/5.56

[@64samsky]

@@tuongtran4862 If someone is stupid enough to mix the two.

[@tuongtran4862]

64samsky It happens since 300 blk round can fit into a 5.56 mag

[@64samsky]

@@tuongtran4862 I mark all my converted 223-5.56 magazines with a big colorful stripe around them, and with the words 300 AAC in big black letters. They will never see a NATO round or anything else in that caliber.

[@patrickc1508]

You forgot that it may cause excessive ammunition expense or excessive time lost reloading. You’re going to definitely have one or the other. $1.25/rd for 110gr vmax or $0.35/rd to load the same ammunition. Those are not the cheapest ones that you can find for that load, but it’s what I have seen the last time I looked. I don’t shoot much supersonic.300 blackout. It’s mostly just for self defense and varmints.

[@sertank735]

Working on a PSA Phoney Badger build. 8.5” 300 AAC collapses down to 24” and is the best truck/backpack/brush gun around. 5 years on and this video is still the best on YT.

[@calvinwright5040]

Phony badger is a awesome name

[@ryanfitzgerald409]

We need someone to mill a lower with this on it

[@riversavage5608]

If I ever want to learn about something gun related, you are the best teacher. I am a retired biology teacher and I recognize a good lesson plan. Nice job.

[@Joe-hz1nw]

You’d like forgotten weapons as well I bet 😃

[@davidschlageter5962]

The quality of this presentation is incredible. Like a graduate school level of information. 5 stars!!!

[@cw2gtc]

Dats Mike...

[@tdubblz]

I promise you I learn so much from this man.

[@urjnlegend]

Its just documenting information, the more i meet "scholars", the more let down i become. His information is great, but society puts a degree way too high for no reason other than invisible merit and pay to win. Great video still

[@Knight_of_the_Old_Code]

For my purposes, I decided to go with an 8" barrel. My .300 BLK is solely used as my vehicle gun/PDW/CQC only platform. Great and informative video.

[@unitedwestanddividedwefall3521]

You mainly running supers?

[@Knight_of_the_Old_Code]

@@unitedwestanddividedwefall3521 I am. I can't own a suppressor at all in the state I live in...unfortunately.

[@NORTHSTARLOGISTICSLLC]

That's the same reason I went with the cartridge....

[@Knight_of_the_Old_Code]

@user-pe3mp6nx5e Update to my platform. I saved up and was able to get a Sig Rattler in. 300 BLK. Same uses as stated in my OP, but in a much nicer and smaller package.

[@Ant_105]

​@@Knight_of_the_Old_Code why supersonic instead of sub?

[@VSO_Gun_Channel]

As an avid 300blk shooter, I really can’t add or detract anything from this video. Good job man.

[@PapaTrump]

I dont want to watch the whine video. For suppressed subsonic ammo what was the best length? Thanks

[@HowdyStranger12312]

Michael H Your mom said she won’t go under 10 inches.

[@derekbutts1782]

@@HowdyStranger12312 daaaaaaaaammn

[@GS-zc4sk]

@@HowdyStranger12312 Noh u didn't

[@o01chris10o]

Personally, I like the 16 inch sidecharger with a 3x. for a lightweight midrange DMR with great capacity

[@Gmar69]

You put an enormous amount of time to make this video, especially looking at you board with all the ballistics. You have done the best research that I've seen yet!

[@Juliang61]

I have a 16" BLK and I use it to hunt. I load my own ammo, like he says 110gr to 125gr. Drops deer to 200 yards and super cheap to load. I love this round

[@musicman1eanda]

Have you tried it out to 300yds?

[@Bmxr1991]

Why 16? I thought full burn is at 9”

[@musicman1eanda]

@@Bmxr1991 You gain velocity out to 16in, perhaps even further.

[@mitchjames9350]

@@Bmxr1991 the longer the barrel the greater the velocity.

[@haydendilbeck8151]

@@Bmxr1991 I believe the full burn is only for subsonic powders. You would gain at least 200 fps out of a supersonic round going from a 9 to 16 inch barrel.

[@ryancoker6834]

My blackout with a 10.5" barrel is probably my favorite rifle. Fun to shoot, easy to pack and operate, and seems to be a heavy hitter. Not to mention the vast bullet weight options and the subsonic abilities.

[@YorktownUSA]

I've got one too, it's fun 😊

[@ryancoker6834]

@@YorktownUSA it's a pig killin machine too.. I find myself shooting it more than any rifle I own

[@YorktownUSA]

@@ryancoker6834 I wouldn't know, not a hunter, but I've heard good things. Mine is a cheap Grid Defense upper, 1:8 twist with M-lok in FDE, pistol length DI gas. Lower is a PSA with a SBA3 brace. Have a Trig MRO and a set of HK style Troy flip ups on top. Internally it's got a Titanium-Nitrite BCG from Brownells and a placeholder charging handle (not really a fan of either, but they work, so...). What is yours, if I may ask? 🙂

[@scott2228]

YorktownUSA looking back, I should have gone the less expensive rout. I got way too excited when it came out and got an AAC rifle costing a few thousand. Now, although I love it, that’s $ I could have used elsewhere.

[@YorktownUSA]

@@scott2228 At least you can brag. I plan to purchase something sweet in 5.56 in the next year or so. Expensive yes, but worth it :)

[@cleetismcdougall5425]

Do a 300 blackout vs 7.62x39 video, suppressed and unsuppressed. Both with like 10.5in barrels. Subsonic and Regular ammo.

[@fnhcat6714]

Cleetis McDougall second that; if you could, add 16 inch barrels. Guessing reliability will go to the AK and Suppression will go to the 300 blackout. Love my MCX - the Gemtech One suppressor makes it a joy to shoot. Took two trips to SIG factory for warranty work before it became 100% reliable (kind of shitty). Using subsonic RUAG ammo keeps you under supersonic. Sold my AK and possibly looking to get one again; so a video on the topic would be great.

[@cleetismcdougall5425]

@@fnhcat6714 I was talking about AR uppers.

[@TCarstens1]

7.62x39 is like 300bo, barrel length doesn't affect velocity very much at all.

[@rodiculous9464]

@@TCarstens1 certainly not past 12" anyways, there's chrono out there of draco vs akm vs rpk and they're all around the same velocity

[@AndrewRMontoya]

This

[@jigman89]

I reload 300blk subs for 12 cents per shot. I load a powder coated cast bullet that will shoot moa @ 100 yards. If you buy a blackout buy a reloader, it will pay for itself.

[@DaveSmith-cp5kj]

The fact that this never became a top comment astounds me. I still can't believe people complaining about the price of blackout but refuse to handload.

[@DaveSmith-cp5kj]

@@___meph___4547 Reloading primers is a thing. I started when I reloaded 50BMG primers since they cost 40 cents each. Work great and cheap.

[@nnerrfman6326]

@@DaveSmith-cp5kj what powder do you use for that?

[@DaveSmith-cp5kj]

@@nnerrfman6326 If you are talking about blackout, I use H110 for supers, and CFEBLK for subs. For the primers I use either the chlorate based if I'm going to shoot a lot (because hey are corrosive and you have to clean it out with water) or the non-corrosive yellow stuff (I forgot the name of it, but it is in the primer handbook from the 1950s)

[@rushthezeppelin]

I need to get back on this. 8 years ago i was starting to work up a load with cast powder coated bullets but then the powder shortage happened and I just decided to put a pause on reloading and hoard all my powder and lead. Still have about 6# of IMR4227. Need to actually find a good 200+gr hollow point boat tail mold and get back on this.

[@retiredretired8496]

300 blk is a re loaders caliber if there ever was one . It is also a fun caliber to reload since you have so many options .

[@neilarellano8470]

It is a very versatile cartridge to reload.

[@kalidilerious]

You mean like 30 caliber loaders have been doing for decades? 308 is the most re loaded center fire cartridge there is. There are many recipes to make a 300 blackOut and you just shoot out of an AR10, the cartridge just looks different. The advantage is when you want to shoot the more powerful 308, you can. The fact that this is being explained means you don't load your own ammo, or you're really really new to it.

[@MylesKillis]

@@kalidileriousor he prefers the more widely available ar15 quality parts

[@joegunderson588]

For hunting I like to use 125 grain out of a 9" barrel suppressed with a 3x prism scope. Where I hunt there is to much thicket and you'll never shoot further then 50-60yrds. It just drops white tale. Awesome round. Great presentation.

[@MrSpicabooo]

Cqb’in deer, nice🤘🏽

[@taylorharbin3948]

I was thinking about something similar for next year’s season.

[@briansmith76251]

Nicely Done. Would like to add, one of the main factors in making 300Blk so effective with shorter barrels and less gassy than 5.56 and x39 is due to the limited case capacity all 300 Blk loadings are using a much faster burning powder. Some of the best loads use magnum type pistol powders and you are achieving 100% burn in 10 inches or less. PLEASE do not confuse 100% burn with optimal barrel length as the gasses are still expanding and providing increased velocity.

[@kassper82]

Thank you for understanding basic physics.

[@martipettty2297]

Can’t remember if this is the 4th or 5th time I’ve watched this video! Best 300 blackout video out there!! Thank you

[@meanevilconservative]

How many course credits do we get for watching this video?

[@lexingtonconcord8751]

I will give you a doctorate. I gave myself one 🤣

[@ChaoticWrath]

I have 3 college degrees in two fields (none of them "arts" degrees); I can confidently say that I gleaned more from this than any course that contributed to that. It's rare that I can sit through an entire video and not find myself annoyed, this guy gets it and breaks it down succinctly.

[@adonian]

🤣

[@andrewkenseth4814]

All of the credits

[@TGFTH]

Lifetime

[@fog8969]

I have lost count of the number of times I've watched or listened to this video, it is so informative. And every time I've done so, I get something out of it that I either missed or that didn't soak in the times before.

[@robertstewart5235]

Very well done. I interpreted the 9” barrel rule as the minimum length you need to have the benefits of all the different types of ammo you can get for 300 blk out. Definitely interesting perspective

[@reallybigguy3120]

Not really a perspective more of a fact.

[@johnnyadams1755]

My understanding was that 9" was all that was needed to get complete powder burn. That doesn't mean you won't gain velocity with longer barrel lengths, you still have tremendous preasure in the barrel. I think many have confused this with being the best length. The length should be determined by what you are going to do with it. IMHO

[@gnuttz5022]

10.5 is. From all my research lately

[@ronnieholloway5057]

Been watching your channel for for a few years now. Your reviews are generally in my range of budget, comprehension, and area of interest. This video is full of awesome insight on 300blk. Just finished my build and your video definitely had a hand in it. Thanks for your hard work!

[@nordfreiheit]

This was really informative. I'm looking for a 300 blackout for home defense, and this really helped. Subscribed!

[@Mrgunsngear]

welcome!

[@bret9741]

@@Mrgunsngear is this the right home defense load for the AR-15? Or would something more like the .458? I know cost plays a part because practice, practice, and more practice helps the odds for a better outcome. But the slow speed and mass of the .458 reminds me of a 12 gauge slug

[@richardcontinijr9661]

@@bret9741 the .458 socom like a 12ga would be a poor choice for home defense. They have way too much penetration and will go thru multiple walls. You want a round that will create a large wound cavity and a reduced chance of penetrating walls. One of the best options would be a .223/5.56 with a hollow point bullet in the 45-60 grain weight. They tend to break up in walls while still being effective.

[@bret9741]

@@richardcontinijr9661 .. the only difficulty is finding .223 hollow point right now :(

[@richardcontinijr9661]

@@bret9741 try ammobuy.com it let's you search by caliber. They show a website that has Black Hills 50 grain TSX 50 round box for $100 in stock. I've been getting XM193 for $20 a box for the range and I bought 2 boxes of the Black Hills for social interactions that lead to interpersonal conflicts. God for bid we actually say it or youtube will delete this comment.

[@mattcarlisle5040]

I really appreciate the time you took to explain all this stuff.

[@zekebeltran4966]

How have I not come across your videos is beyond me, you mentioned onther channels I watch daily. Appreciate you man.

[@careylogan8455]

Finally someone who tells it like it is. I got more answers to my questions in this 27 minute video than 27 hours of watching KZbin videos on the subject. I am a 300 BO fan and have 2 uppers for my one lower. I am also a subscriber now. thx for the info. I reload all of my 300 BO cartridges so I get a bit more range time than the normal shooter. My "go to" cartridge uses the 115 gr. Lehigh Controlled Chaos bullet for "varmint" control. I also practice with 155 gr bullets. I have a 1:8 twist barrel that I fire lapped with David Tubbs components. I was able to get sub MOA groups with the 115 gr Lehigh bullets in the AR platform. I have been watching and implementing some of the recommendations of Grand Thumb in set up. Your video is the icing on the cake!!!!

[@edrag69]

This video educated me and debunked the myths I had come to believe. Thank you again for your hard work brother

[@124thDragoon]

this is probably my favorite video you've done so far. I appreciate a good data dump. And all in one take?! Dude!

[@Mrgunsngear]

😁

[@SudsMcDuff007]

Never noticed that the first couple of times I watched this. Nice.

[@darthmartinez]

I have a Wilson Combat 18" Barreled upper its accurate and I've taken a few hogs with it. I have found that once you get up past 150 Gr bullet weight the projectile drops significantly and you need at least a 30mm scope if your shooting at longer ranges or you'll run out of elevation adjustments. I like to stay around 110 to 125 gr bullet weight that seems to be the most optimum bullet weight for hunting.

[@absolute757]

Have u used it for deer?

[@2adave946]

Dude this is the best informational 300 blackout video on KZbin... Now I'm trying to find a budget suppressor..

[@InvestWithFFI]

I’m building my first AR now. Gonna go 300 blackout for home defense purposes. Did you find a good suppressor?

[@briandimaggio9719]

KNOWLEDGE, DATA, DETAIL, AND EXPLANATIONS ARE GREAT. AND NO OPIONS BASED ON "JUST BECAUSE". A GREAT HELP.

[@AlphaRomeoOneFive]

For HD I'm running a 8.3" 300blk with 110gr Barnes tac tx and a Dead Air Sandman S can. Amazing setup, amazing round!

[@ssspencerjr]

I wonder how loud that is indoors.

[@AlphaRomeoOneFive]

@@ssspencerjr I've shot it outdoors without ears on and it's doable. Indoors I'm sure it would hurt, but if I had to pop off 10 rounds I don't think it would cause permanent damage which is why I went with this set-up.

[@AlphaRomeoOneFive]

@Nick 718 Yes, I found out the hard way it doesn't stabilize Hornady 190gr Sub X rounds. Tore up my can and had to send it Dead Air for repairs which they were great about.

[@AlphaRomeoOneFive]

@Nick 718 It runs lighter grains perfect, and I've shot about 100 220 grain Hush subs from Freedom Munitions prefect. I just picked up 100 rounds of MagTech's new 200 grain subs but haven't had the chance to try them out yet.

[@AlphaRomeoOneFive]

@Nick 718 Yeah I was pissed to say the least! Now I make sure to test out new ammo without the can on first 😂 live and learn! I'm planning on making a video about the experience and will test out the new subs on it as well

[@c.l.e.a.n.nation]

Brother I had to revisit this one because my next project is going to be a 7.5" 300 Blk: Bag/CQB gun...I wish I could've served along side you when I was in the Army, you are crazy with the gun talk brother...🐐

[@veronicacastro565]

Humble, educated AR expert. Really

[@pippupaladin]

I'd love to see a gel test comparing a couple .45 acp rounds versus .300 AAC subsonics

[@paraglidingnut26]

Federal HST+p 230 grain rounds hurt your hand while shooting with a handgun. I know 300 BO has better terminal performance, plenty of videos discussing that. But I would definitely consider a .45 pcc with +p rounds for self defense.

[@capvent]

This was probably the most informative video I have seen on this topic. Really appreciate the time spent here. Very impressive.

[@theriddler4914]

Good info and great video. You should do a pros and cons or versus video for 5.56, 7.62x39, 300, 6.5 and 6.8.

[@Quality_Guru]

Loved the video. Lots of details and data, as well as, relative comparison between the 5.56 and 7.62x39 rounds. Reminds me of a Paul Harrell Video when he tells you this is the boring part, and that’s the part we love the most. Outstanding information for anyone looking to make a next firearms purchase. Every time I watch your videos I learn something new.

[@stevekrilich3040]

Great video Mike. I took a hog in Missouri with my 16” barrel .300 BO rifle with a pistol length gas system using 125 gr. Hornady American Gunner ammo. One shot at 80 yards. Hog down and done instantly.

[@---tx9xx]

How was the performance for you vs hog gunting with .223?

[@philroe2363]

One of the best aspects of the Blackout is that there is such a wide range of bullet weights that lets you match velocity to your barrel length.

[@GretaBeth]

I just bought a DDM4 300BLK 16” (I’m in CA with limited barrel options). Thank you for all this info!! It’s exactly what I needed.

[@infamousnova]

How you like it?

[@wakichunu]

im so sorry you live there

[@ArrowAffliction]

I love my 300blk and i always use the lighter ammo for that extra velocity and energy .

[@kixforrest2358]

I as well - I have settled on the 115gr Lehigh Defense (Controlled Chaos) = Fragmented Bullet - so there is mostly never a big issue of over pentation and going through walls & hitting a family member. I have 6 pre-Loaded 30rd mags for Home SD - each mag contains 20-CC rounds & 8 -194gr Maximum Expansion rounds - placed through out each magazine. Hunting mainly Wild Feral Pigs & other annoying Predators - I choose the 110gr & 120gr TAC-TX. My range is only out to 200yds with my Holosun HS510C - This is Perfect for my needs! -- I don't pretend to be a wanna be sniper - the 300BLK & 200yrd range is ideal for my physical capabilities. Lastly for the Moment SHTF - My son & I have more then we can carry (30round mags) - loaded with a variety of 110gr to 147gr. (What ever we could find over the past 15yrs. We both shoot via 16" barrel - Mine has a 1-7.5 twist.

[@charlesmckinley29]

Thank you for confirming I want at least a 10.5" barrel.

[@nickrockz97]

Charles McKinley just get a 5.56, 300 blk is just a stupid gimmick hype

[@TheKeyMaker]

@@nickrockz97 yes because socom is a gimmick. I think some people might disagree with that logic.

[@YourSweetDevil666]

I have a 5.56 rifle,, and that's why I built a 300 blackout.some of my 5.56 brass becomes 300 blackout.

[@ryanwilson5936]

Nick rockz How?

[@talltale9760]

10.3/10.5 inch 5.56 for general use and 7.5 inch .300 for home defense

[@TheFacelessMan82]

3rd time watching this. I'm very interested in building a 300blk pistol for my home defense gun. This video is extremely helpful with barrel selection, ammo selection and general info. Really, this is one of your best video's yet.

[@evanclark6547]

Did you ever build it? If so, what size barrel did you end up choosing? I'm trying to put on together now. I've got everything except the upper. I can't decide if I want a 7.5, 8.5 or 10.5.... I'd like a smaller options for shoving in backpack or car. But I don't want to sacrifice ballistics.. although according to this vid, there isnt a huge diff between 7.5 and 10.5...

[@slightwave]

Man, it's a pity in KZbin you can not put a monument to you. You are simply the best!!!

[@veronicacastro565]

I cannot say enough about this cat. He is like an interesting teacher plus a great self defense buddy

[@Mrgunsngear]

thanks 😂

[@ryang8040]

To be fair the effect of decreased barrel length on 300 BO is less than 5.56. That said, longer barrel pretty much always means more velocity no matter the round.

[@AlbertoHernandez-gl8ut]

The thing behind 8.5 or 9 is that the round achieves full burn at those barrel lengths but it will still benefit from a longer barrel since the gasses behind the round are still expanding even up to 16 inches

[@timrobinson6573]

One reason you may want a 16 inch 300 blackout is legal issues. In Florida you can have long guns loaded and openly displayed in your vehicle but pistols must either be on your person or locked in a container. If you want a truck gun in 300 blackout it would have to be locked in a container if the barrel is less than 16 inches. Also, with the pistol brace rule from the ATF all of your 300 Blackout pistols are now illegal or you have to ditch your brace or have to be registered with the ATF.

[@tenormdness]

Built. Finally. Took me 2 months, first build from scratch. Can’t tell you how much this channel has helped me learn. Now time to play super super while I wait for the government.

[@edbertgil8267]

I consider you one of the most informed and best in youtube when it comes to information on firearms and everything related to them. Thank you Sir for what you do.

[@MovieLineMaddness]

Talk about a guy who really knows his stuff... excellent video. I own a BCM 9” 300 BLK I use Gorilla’s 110 grain Varmageddon and Hornady’s Black 110 V-Max for self defense, home defense and most other situation along those lines. Subsonic end, Gorillas Silverback 205 grain and Hornady 190 grain Sub-X. Practice ammo is Sellier & Bellot 124 grain FMJ and 200 grain FMJ. Using an AAC 762-SDN-6 suppressor I can say I’ve ever had an issue running any of the ammo mentioned above. Also just in case from my experience mentioned above, the BCM 9” that I own came from Bravo as a 1:7 twist and buffer which I believe is an H1 buffer weight for anyone concerned about not stabilizing and or feeding issues. No issues at all suppressed or unsuppressed. Thank you so much for all your videos and work that you put. We greatly appreciate you my dude!

[@Blue_Collar_Colonizer_1776]

The recce? I have a BCM recce 9. I totally agree with your comment. I watched some videos today going over buffer weights. They seemed to think if you shoot suppressed the buffer should be an H2 at least. But I haven't had any problems with the H1. I thought about putting in an H2 because they say it'll help some recoil (not that it's an issue) but nothing to do with the cycling using a suppressor. The only issue I've had at all with the gun is because I bought 1k rounds from a guy who loads. Somehow on a few of them after the primer is fired it comes out of the round then gets stuck between the bcg and the lower jamming it up. Other than those shitty rounds it's pretty solid

[@COJASh1]

Thanks a lot, finally someone who understands 300 BO supersonic ammo. Love the Barnes 110g black tip.

[@madzebra5491]

Funny how these things just turn into either or conversations. Just get one of each! I will say though, my 8.5" SBR in 300BLK with subsonic & can is obscenely fun.

[@glockfanboy4927]

I bought both n couldn't decide which I liked better!!!! Glad I bought both!!! Covers anything that comes in the door!!!☠️☠️

[@InvestWithFFI]

But which are you grabbing when something goes knock in the night?

[@allenc.2942]

Picked up my 300 BLK pistol from my FFL today. Thank you for the info needed to go down this road. I have some 110gr Noveske with the Nosler Varmageddon bullet to start and the 150gr Fiocchi for the range. I'll now spend a lifetime testing 300 BLK rounds for fun.

[@sarge12212]

I keep a suppressed 8" 300BLK with subsonic rounds ready for home defense. And I keep a 16" unsuppressed upper for hunting with supersonic rounds for hunting. And a .22lr dedicated upper for plinking. Got rid of the .556/.223 uppers to mitigate the 300BLK rounds accidentally being loaded into a .556/.223 upper. Only need one braced lower for all of them. Takes up less space in the cabinet, lol

[@---tx9xx]

subsonic 300BLK, what advantage does it have over just suppressed subsonic 9mm, in say, a PCC?

[@bullittsandbullets1821]

@@---tx9xx subsonic 147gr 9mm is 326 foot pounds Subsonic 220gr 300blk is 520 foot pounds Not to mention the length and weight of the 300 bullet is better. And it’s much more reliable than a pcc

[@406MountainMan]

Thank you very much for a wonderfully informative video. I appreciate all the grunt work that went into this production.

[@Mrgunsngear]

Thank you

[@johngolden9074]

U always give us fantastic content and your "grunt work" is obviously extensive thank U for doing it so we dont have to. Thanks for the term grunt work 406 mountain man.

[@carny2k]

@@Mrgunsngear probably wont get an answer but what about in states where we cant suppress? would what barrel length would you suggest?

[@bobwampler3387]

Thank you for going through the trouble to put this together. Very, very informative.

[@wncoulte]

As a 300 Blackout Owner now (officially, since my Dead Air Sandman L stamp was delivered), I have to say this video is a WEALTH of important information. AWESOME video, Mike!! Thanks and keep on giving us great content.

[@LoneStarDrakes]

What are you shooting out of it Ammo wise I just ordered my sandman l yesterday for my 10.5” pistol Any vids Thanks man

[@wncoulte]

@@LoneStarDrakes S&B ammo only. The suppressor is amazing so far. Had a massive baffle strike two months ago, but Deadair fixed it within two weeks.

[@wncoulte]

@@LoneStarDrakes kzbin.info/www/bejne/pKW7k4CPZ6eogMU I have more videos but just haven't uploaded any yet.

[@LoneStarDrakes]

You’re in SC ? Me too I’m in Columbia maybe we can link up

[@LoneStarDrakes]

Also where the hell did you find 220 grain subsonic lol

[@islanderATP]

5 years old and still a goldie. I just got a 10 inch 300blk pew pew. This was great info, and re-inforced my decision=)

[@Mrgunsngear]

nice

[@fmxmyway]

Thanks for taking the time for the video. Awesome data.

[@mattgill69]

Ive come back and watched this video 3 times now. One of the best videos you’ve made @mrgunsngear . I wish youd make a part two of this video where you’re comparing the accuracy and range capabilities of the 300bo cartridge offerings out on the range.

[@rzr2ffe325]

Man what a thorough presentation. Excellent job. Yeah everything is a tradeoff, but I think the handiness/maneuverability with a suppressor is worth the slight loss in velocity. A case for 8-10" barrels

[@GunFunZS]

That and portability and concealment. A small AR pistol is very convenient to wear in the woods.

[@InvestWithFFI]

Yeah, I think I must agree.

[@andrewnesbitt2523]

Funny how this was made in March of 2019--which is 5 years before I'm writing this very comment--and I'm watching this literally 2 minutes after ordering a 7.5" .300 Blackout barrel with a 1:5 twist. Thankfully it looks like I made the right decision! Yes, I know you can get better terminal ballistics with longer barrels, but it just seems like the best velocity & energy per barrel length ratio. Man, .300 Blackout is such a great cartridge if for no other reason than how it does *great* with shorter barrels!

[@nunyurbyznes7611]

The gun world is a better place because of you Mr. Mike! Thanks so much!

[@garyh.7282]

I had a friend ask me about the gas mileage with my Dodge Hemi pickup I told him if I was worried about gas mileage I would have bought a Neon same applies here. I shoot enough to be proficient but not enough to worry about cost, besides I reload so I can shoot a lot on the cheap. I know some don't have the time or confidence to reload but it ain't rocket science and a lot of fun.

[@samadams9557]

Thanks for all the effort you put into your videos. Definitely good stuff with no fluff. Very much appreciated.

[@chitterlingsrtasty]

had 9.0 windham armory have some nasty keyhole-ing. it was a 1:7.200 and 220 grain. I've not had an issue with the three 1:5 twist barrels I have.

[@mec1107]

By far the BEST 300BLK video on the internet.

[@marvinbrock960]

The Winchester 300 blk Deer Season XP 150gr round is awesome! Expands perfectly and very accurate in several 300BO I’ve shot it through... 👍🏻

[@forestwolf60]

What yardage are you shooting out to? From my understanding, it's only really effective to 300 yards or less.

[@kennethwilson7315]

Adam Huffman 300 yards is really about the limit of any intermediate rifle caliber like 5.56, .300 blk, or 7.62x39 anyway. Honestly, I prefer to cap them all as 200 yard cartridges for an ethical behind the front shoulder kill on a small to medium size adult whitetail deer. Considering the wooded areas I hunt, that’s usually plenty of range. At 300 yards and beyond, I’d rather step up to a true rifle caliber like .308, .30-06, .270, etc. Now, it’s certainly true that deer can be put down with lesser calibers like .17HMR, .22WMR, or even .22LR. You’re talking about critical shot placement into the brain in order to keep a deer from running forever before dieing at that point though. I’m not talking about what can be done especially if it’s taking game for survival. I’m talking about making a clean ethical kill in a non-critical hunting environment.

[@myretroworld1121]

Im using a 300blk for deer season this year. I also chose winchester 150gr deer season xp. I'm use to a 30-06 with 180gr corelokt so I'm just wondering how those deer rounds worked with your 300blk?

[@ianmather7602]

Love 300 blk in a 16" rifle config. 110gr barnes out of it are vicious

[@Mrgunsngear]

nice

[@thealsatian4232]

Agreed it’s a wicked round

[@chancecarlton8403]

I'm using the same setup for several years now, very effective. I think of it as the modern modular 30-30. Great woods gun.

[@nickrockz97]

Ian Mather why not just 5.56? cheaper and more velocity and more flat shooting.

[@thealsatian4232]

Nick rockz a 5.56 is flatter shooting and cheaper. But, I rarely shoot beyond 200 yards because I don’t see game at longer distances here in the Texas brush country. Within these distances the.300 is measurably more effective on game.

[@bgunter3]

I have 8 deer in the freezer which are proof of the effectiveness of the 125gr Nosler BT out of a 16” barrel (2200fps). Also, 300BLK supersonic suppressed is MUCH quieter than 5.56 suppressed.

[@MagicPrepper]

Thanks for the info. I am working on a 10.5" build right now and you answered many questions.

[@evanclark6547]

All this time later, are you satisfied with the 10.5 or do you wish you got a different size?

[@MagicPrepper]

@evanclark6547 oh wait this is 300blk. I have a 9" MCX now. Amazing gun.

[@TheWeatherbuff]

Thanks for validating my choice to go with 300 for HD, and for crunching all those numbers. Yes, I have a 5.56 too, but I'm a 300 fan, for sure. There are only about three channels I trust for data and testing, and yours is one of them.

[@Megames2012]

Next, compare it to 6.8 SPC and 7.62x39; the 300 Blackout will show it's true colors. Good for short barrels and good for suppressor use, but when you start using longer barrels, there are better cartridges.

[@Megames2012]

@Nick 718 While 300 Blackout wasn't intended for longer barrels, it, like all other calibers, do benefit from longer barrels. 6.8 SPC was also designed for CQB, and it achieves that and then some; the ballistics are better than 5.56, 300 Blackout, and 7.62x39. And while we're talking about it, no, 300 Blackout does not out perform 7.62x39; when comparing similar grains, 7.62x39 has more energy than 300 Blackout or 5.56 62 gr green tip at 300 yards.

[@bobhaehn5470]

Thanks Mike. I appreciate the no bs vids. I've been interested but skeptical of the 300 and you've addressed many of my concerns and questions.

[@TheWeatherbuff]

Thanks, from all of us 300 fans. The Gorilla ammo is great, and I've invested in the copper rounds too. 16 inch barrel, supersonic. Works great. Mine is strictly for defense. I appreciate all the research you did on this.

[@edwardrobinson9131]

Third time I’ve watched this video since you posted it… I learn something new every time… Thank you for doing god’s work sir…

[@JTheraos]

Where that whole "9 inch is the optimized barrel length" thing comes from is the fact that a 9 inch barrel has the best length to fps ratio. You gain less per inch in any longer of a barrel, and from like 7 to 8 or 8 to 9 has the biggest increase in fps. That's what I remember reading from a barrel manufacturers website.

[@MysterThree]

Same concept with 556, better out of a longer barrel but not much lost going from 16 to 11.5 below that it’s a mobile flashbang launcher shooting 22 mag, a bit better out of 20 but you only gain a couple hundred fps for an extra 4 inches of barrel, which 20 really to me at least is most useful in a dmr/spr using green tips, besides that may as well go short, just my hot take.

[@elmexicanoforlive]

I think you mean 16”, bellow that most ammo doesn’t reliably fragment unless you start getting into specialty ammo. 11.5 is only good for CQB type engagement with a suppressor. The concussive blast from such a short barrel sucks if there is anyone besides you. It may not sound like a lot of difference but a muzzle break shoots out gases to the side of the shooter. So to the people around you it will make a difference, unless you run a suppresor. 16” is the middle ground when the 5.56 was designed for a 20” barrel. It’s the best overall length for 5.56. Anything shorter you are better off with 300BO.

[@blakew5672]

Expected a comment section full of blackout hate, surprised to see the opposite. Great video. Blackout is a great round and the prices are starting to get reasonable.

[@GunFunZS]

Same as 45acp... Not that big a deal.

[@dsstrauser6144]

@@GunFunZS Bullet weights yes, wound damage. Not even close.

[@bojackson3923]

He broke it down.. I now have zero questions.. I decided n I bought AR pistol 300 blackout 7.5' barrel...great video

[@DG-888]

Im about to do the same only a 8.5 bcuz its on sale. Still good, any tips? Did you go with a 1:7 twist or 1:8?

[@Bajajaba480]

@@DG-888 bahaha same, & 1:8 was OG, most doing 1:7 now.

[@DG-888]

@@Bajajaba480 im doing psa 300 blkout with a red dot

[@TwoGreenDots]

I choose 16 inch barrel for more velocity, better terminal ballistics and general purpose usage.

[@andrewsquire9892]

Awesome. I bought a 12.5" barrel (sale impulse) and am collecting the parts to build. Great explanation about ballistics. I was thinking I should have gone shorter, but this info helped feel it's okay. Thanks for the great info.

[@CWHolleman]

Not horrible, but at that length you could be running the far cheaper 5.56 with pretty decent ballistics.

[@kryptonite77f6]

I too, built a 12.5” NOVESKE 300 blackout SBR. I found that to be the sweet spot in maximizing velocity and performance across a wider range of bullets. If you notice in the video he clearly states he’s open to the 12.5 BCM taking the place of his 9” build

[@andrewsquire9892]

@@CWHolleman thanks. Agreed. Ammo has doubled- less bang for the buck! I did buy a 10.5” 5.56 barrel for the option to switch it out.

[@andrewsquire9892]

@@kryptonite77f6 nice. Now if the “pistol brace” issue would go away…

[@armeddiver]

Thank you for making this video. This is the third or fourth time I have watched it. As my experience grows with this cartridge the more I gain from this video. 300 BLK is my favorite cartridge. I don't even own a 5.56. While my favorite ammo is Hornady Black 110gr and Sig 220gr, I have had great luck with American Marksman Stryker 147gr. I am not a hunter. I just like to build guns, shoot and learn, and this caliber has/is teaching me a lot. Personally, the shortest barrel 300 BLK I have is a 10.3". My preferred barrel length is 16". I am planning to get a Ruger American Ranch in 300 BLK. The Ruger American Ranch has a hammer forged 16" barrel and I am really excited to see how it handles my favorite loads. Thank you again for making this video. I hope you never take it down.

[@wethepeople420]

The only rifle I have is 300BLK and we own a tactical gun range course. Sometimes we have a pretty large group of people with their guns out for the day. The difference between my 300 and every one else 5.56 is huge. It’s like I’m a time traveler from the future by comparison. I can go ultra quiet/suppressed. Or hit hard with supersonic by just changing my mag. I’ve had many different rifle calibers over the years and 300blk is the most versatile and Advanced round to date.

[@FitnFire]

Thanks for answering my question! I’m glad to see that I was on the right track on something I have little experience with. Obviously, there is a ton of information I will need to continue to research.

[@Mrgunsngear]

🇺🇸

[@MrMace313]

Correct me if I'm wrong but the 308 boat tail bullets are more aerodynamic too than Soviet 7.62x 39 .

[@davydwalker8554]

A ton of great info!! And just FYI, I really like the .300blk Wilson Combat 11.3", 1 in 7 twist barrel.

[@seanmurphy2360]

Hell yeah man thank you! This is exactly what I needed to hear 👍

[@BravoJulietAlpha]

@mrgunsngear I find myself back on this video yet again. Since apparently pistol braces are gone, unless someone who matters grows some balls really, anyway I'm looking at putting together a 16 in 300 blk supersonic setup, so thank you yet again for all your knowledge. God bless America 🇺🇸 Brother!

[@starwarsheros9245]

I have a 300 blackout with a 16inch barrel and its amazing took 2 deer with it.

[@lundy762]

What ammo were you using and what range did you take the deer? I'm really interested in dropping 308 and going 300 blackout for deer as well.

[@starwarsheros9245]

@@lundy762 Hornady Custom it was at 130 yards. Right in the battery box, ran little and dropped.

[@starwarsheros9245]

@@lundy762 to add more to it, it's the Hornady custom load, 135 grain FTX just doubled checked the box.

[@2wheeleddemon999]

@@lundy762 dude I'm dropping 300BO and going with 308 😊

[@gummybear41283]

can it drop a bear?

[@sethrich5998]

From hog hunting I’ve noticed the .30 cals do so much better at single shot stops. Both .300blk and 7.62NATO drop hogs effectively, the 5.56 is difficult to get a single shot stop. I like 5.56 but it does show some limitations.

[@spookypunky]

Idk, I've read that 50 gr Barnes TSX drops them.

[@sethrich5998]

spookypunky Sure individual loads do better. But 5.56 is very load dependent, where the .30’s are still fairly effective even with standard ball ammo.

[@---tx9xx]

have you hunted hogs with subsonic BLK?

[@Warptenlololol]

I'm absolutely new to 300BLK, I have learned many many things in this video and appreciate it very much. In my country a semi-auto in 300BLK is easily available but 5.56x45/7.62x39 is harshly regulated (like a class 3 in the U.S.A) and the minimum length for the barrel must be 18", finding informations for long barrels in 300BLK online was complicated and depressing, this, again, was really useful thank you a lot Mrgunsgear, watching another of your video also compelled me to buy a "lock" for my Beretta 1301 bolt release to avoid the dreaded turbo-jam. Regards.

[@nicholasplattner7269]

I agree with everything you said. I’d say, most people who say it’s optimized for the shorter barrels are comparing it to the 5.56 round. I think if you compare the 300blk against itself. It’s silly to say it’s optimized for shorter barrels. But if you compare it vs a 5.56 in a 7.5-14” barrel. I think the 300 out performs it. I’d like to see the comparison on those 2 rounds. Great info on bullets and performance in each barrel.

[@rmcnabb]

Wow. It's really rare to find information of this depth and quality on a youtube shooting channel. Thank you very much.

[@GreenMountainDefense]

This is going to be my go to referral link any time someone asks me questions about BO from now on.

[@kennethmarkwith4678]

I bought an AR earlier this year (300 BLK with a 16' barrel). People in an AR group I was in on FB were talking trash about the barrel length. From what I understand about this caliber and why people buy shorter barrels is because they generally use a can. I have no intention to buy a suppressor. I cared about having something that packs a helluva punch up close and can still pack that punch at some distance. I also caught a really good deal on the gun.

[@RideAlongside]

Been waiting for this one! Thank you for taking the time to be thorough.

[@incredible3214]

You, sir, deserve the Paul Harrel award. Excellent info chart, and thank you for the added window.

[@Mrgunsngear]

Very welcome

[@RemusTheRegular]

Have my 5.56, have a 300 blackout, next purchase is an AK. As always, great video

[@headoftaxreformandpercenta4908]

I've been researching my next gun/parts quite frequently and this covers so much of what I've been curious about. Thank you for this great information, sir.

[@uriahturd9695]

I was trying to decide which barrel length to go with, I think I'll go with 10.5" for that extra umph. Mainly a home defense pistol but I want to be able to cover some distance for fun.

[@bradfordfamily7]

Not much "umph" from the 7.5 up to the 10.5: in supers only ~90 ft/s and ~90 energy improvement, or a 4% and 8% gains respectively. No difference in heavy bullets. Is 3 inches worth it? If you like shooting subs, the 7.5 and 12.5 barrels seem to be the best options depending on whether length/maneuverability is most important, or maximizing your subsonic/supers speed are most important. And the 12.5" gives you a 17% improvement in energy when shooting supers. If you want "umph," I think she will tell you that 2 extra inches means alot to her...