5.56 vs 5.45x39 On Mild Steel: NOT So Similar After All?

In today's video, we will be comparing the performance of the 5.56x45 (5.56 NATO -using 55 gr FMJ and M855) and the 5.45x39 (using 60gr FMJ and 7n6) on mild steel. Testing was setup at 50 yards using A529 gr 55 mild steel. Thanks for watching!
Testing: 2:20
*These tests are meant for entertainment and educational purposes only. Shooting steel can be dangerous, so do not try any of these tests at home!
At this time, I do not have any coupon codes for MidwayUSA.
#midwayusa

[@ryanthomas5962]

7n6 was never hardened steel, and it was never intended to be hardened steel. It’s just a mild steel, with a lead plug at the back, used because steel was in vast supply for the Soviets. It’s no where near 60 HRC on the hardness scale. 5.45 didn’t use a hardened penetrator core until 7n6m was produced in 1987. The steel in that bullet was hardened to 60 HRC. This round is exceedingly rare to find in the US. It was never really imported; the tiny amount that did make its way here was more likely an accident than intentional.

[@bananaballistics]

That makes sense. I bet that was the info that I was reading and didn’t realize that there was a difference in designation

[@redfaux74]

@@bananaballistics - You have a troll using your site for scamming purposes. Under my name in the comments.

[@juanbaixeras6965]

I have some im selling on gunbroker

[@nicolas8098]

@@bananaballistics They are often non distinguished in designation just like 7N10 and 7N10M , 7n24 and 7N24M and 7.62x39 PS and 7.62x39 PSM

[@mtnbound2764]

knowing russia, even if it was supposed to be a hardened steel core, it probably wasnt. but also i thought the purpose of that round was moreso to tumble then penetrate.

[@BigSmartArmed]

7N6 is a MILD steel core, intended to reduce manufacturing cost, not to increase penetration.

[@PyromaN93]

It also makes bullet very unstable after hit

[@bigbadaboooom]

7n6 is not AP at all

[@theimmortal4718]

It also allows the bullet to be lighter for length

[@theimmortal4718]

Can't imagine why it would be cheaper. Lead is cheaper than steel

[@kmieciu4ever]

@@theimmortal4718 In Soviet Russia, steel is cheaper than lead ;-)

[@user-sf1xt8on4y]

I, as a resident of Russia, can assure you that the core of a 7n6 bullet has never been 60HRC, but has always been mild steel

[@camus83489]

lol russia sucks

[@adrianrubi5012]

Kills by tumbling inside a human target?

[@user-sf1xt8on4y]

@@adrianrubi5012 Penetrating 5-7 cm into the soft body, it begins to tumble there

[@goldenremnant2610]

@@adrianrubi5012as does the 5.56.. Tumble and fragment kinda at the same time.

[@adrianrubi5012]

@@goldenremnant2610 no wonder Reid Heinrichs zeroes them in the same manner he kinda said they were ballistic twins.

[@texoschannel4907]

7n6 is not an armor-piercing round. It has mild steel core, but the round is not declared as an AP round. For AP purpose there are 7n22 and 7n24

[@worldoftancraft]

Daže 7n6m uže hotj skoljko-to probivnaâ. Molča o 7n10. I têm bolêê o 7n22 i 7n24

[@user-fe5dn6sd6m]

7h39

[@VroomNBoom]

And 7n6m aswell

[@user-vz2wb8hm5g]

So as too M855 is the same that russian one

[@user-db8mz6lt6g]

@@user-vz2wb8hm5g now there is 7n39 with a tungsten rod

[@sameerghayya3203]

Straight to the point. No unneccessary talk no cringe. Subscribed

[@adamcichon6957]

From what i've read, 7n6 mild steel core is nothing more than cheaper FMJ full lead core equivalent... Citating from Wikipedia, true AP 5,45 rounds are only: 7n22 (from 1998, red ring above neck and black tip, pointed steel penetrator) 7n24 (from 1999, tungsten carbide penetrator, black ring above neck) and the newest 7n39 (from 2013, tungsten carbide92%/cobalt8% alloy penetrator, black ring above neck).

[@worldoftancraft]

7n6 is light bullet that's substantially lighter than lead FMJ. Research the material part before typing your fancy, and really-really convenient QWERTY keyboard, dorogoj inostranêc.

[@adamcichon6957]

@@worldoftancraft have a nice day, it looks like you need some nice and kind words in your life, since you're brothered so much about so little...

[@worldoftancraft]

@@adamcichon6957 I am good, at the very least not bad. What I say is you could not write a misconception. Reality is more complicated than what you said. Do vstrêč.

[@GrouchyOscar-cx6df]

The ultimate guide for what thickness steel plate to wear underneath your Clint Eastwood poncho

[@user-db8mz6lt6g]

The 7n6 cartridge has a steel core made of mild steel; steel was used instead of lead because it was cheap. armor-piercing ones start from 7n10. The 5.45 cartridge has higher ballistics, so armor-piercing bullets can penetrate armor up to 500-600 meters 7n39. At the same time, the 5.45 cartridge is lighter and smaller than 5.56, has less recoil, and is cheaper. higher engineering product

[@Fausto_4841]

first time seeing your channel. there's a lot of guys making similar content, but i think you're doing it better. no cheese and no ego, just straight to it. you've also got a great voice for recording, used to be known as a voice for radio. (which is a lot better than being told you've got a face for radio haha)

[@mikesavoie3142]

I have a face for radio but I don't have the voice, lol!

[@Hjerte_Verke]

I guess you missed the cheese sprinkled liberally throughout the video.

[@garryb374]

The steel core was intended to make the rear of the round lighter than it would be with a lead core. The cavity in the front that the lead plug moves forward into also shifts the weight to the rear, when the lead plug moves forward normally the shift in weight would improve stability but because it does not move forward asymmetrically it actually causes the bullet to flip nearly on impact so there is no first wound channel and then an enlarged wound cavity. The complex design is intended to make it create a large wound cavity without fragmenting.

[@af7119]

Great channel. Love that you're always improving your testing methods and setup, like a true engineer.

[@Karza_357]

Thanks for making these. Always fun to watch.

[@juliusdream2683]

That flower pedal effect is cool looking. The same thing happens with the old antitank gun the 37MM slamming threw big steel plates punching threw them leaving that exact same flower effect just bigger. This is like a mini version . Great job.

[@jfess1911]

It was discovered with steel core ammo like 7N6 that when the jacket stays inside the bullet hole, it slows down the core passing through it. Some later version of 5.45x39 ammo were optimized for penetrating steel and aluminum. They use a hardened and more pointed core with.a little lead between the tip of the penetrator and the nose of the jacket. The lead's job is to split the jacket at the front so the penetrator can go through the barrier (steel or aluminum) without dragging the jacket through the hole.

[@GBGuns]

Must watch any and all 5.45x39 content. I love that round and miss the days of getting a spam can of 7N6 for $0.18/round

[@sRagnar]

The 5.45 has less energy, therefore less recoil, but still has a better bullet BC. If you shoot not at 50 meters, but at 300-400m, then the penetration ability of 5.45 is higher than 5.56. That's what it was made for.

[@user-db8mz6lt6g]

exactly. Cartridge 223 is a copy of the sports 222, 5.45, a product of high engineering.

[@TheJimyyy]

5.56 can shot heavyer bullet so it have a better bc and most 5.45 have a steel core to penetrate stuff when 5.56 dont it is not about the caliber but the bullet type

[@TheJimyyy]

And i just finished wacht t he video the 5.56 did pen more in is testing lol

[@TheJimyyy]

@@user-db8mz6lt6g hight enginering that do everything worts that 5.56 expect recoil thats funny

[@user-db8mz6lt6g]

@@TheJimyyy justify your comment

[@lindafoxwood78]

Wonderful video. I have watched this 3 times and didn't remember you talking about Midway Arms! All of my reload cases for my 44 mag and other stuff were from Midway back in 1986 when I was stationed at Fort Hood Texas. Keep up the great job.

[@Boostedbanter]

the one ive been waiting for and why i subbed!

[@ExpLaser]

Попробуй найти патроны 5.45 с термоупрочнённый сердечником, в 7н6 никогда его не было. Это всего лишь мягкая сталь марки ст10, для замены более дорогого свинца.

[@blinchikfresh1527]

был, после 86 года.

[@BadBlitz]

Even though I`m a Swede that never even held a gun in real life, this channel is becoming one of my favourites! 😄

[@trackpackgt877]

Hello from America i though u swedes were aloud to own guns?

[@BadBlitz]

Sure, they're just not very common here =)@@trackpackgt877

[@pe.bo.5038]

@@trackpackgt877 They are!Also they still have conscription,so this posting is not logical.--He could have done alternative"Civil-service" or be unfit for service!

[@trackpackgt877]

@@pe.bo.5038 oh ok thanks for the info brother i thought sweeds had to serve in their military and were required to own a rifle seen a documentary on it so u may be right about him ☝️

[@joshdiehl8737]

​@trackpackgt877 That's not the Swedes. Sweeden has extremely strict gun control. You're thinking about the Swiss as in Switzerland. They have more lax gun laws and everyone serves in the military

[@observer4916]

This is beautifully concise. Well done

[@duranbailiff5337]

Awesome video Brother! Yes, we want to see a repeat of this video using 20 inch barrels. Thanks in advance. 🙏🏼

[@alanniederlitz8630]

awesome! 545 one o my FAVE cartridges!

[@lorenzogarcia7304]

Your channel is awesome dude good job

[@zacharybrink5088]

Good stuff, right to the point . I like how you didn’t take 20 minutes to make the same points .

[@vegeta420z6]

This is why everybody loves you Raymond.

[@711kfuu]

It is rare to get a comparison with this magnificence.. shoot glory🎉😊

[@Melvinmutt]

Great video! And good things to know!

[@kamata93]

5.45 was made more to inflict maximum damage to tissue. 5.56 tends to work better against harder stuff even though it also fragments on impact with tissue.

[@brianc9374]

Which 5.56? The original 55gr out of the 1in12 twist Or the 62 steel penetrator out of the 1in7?

[@toddparsons2980]

Cool comparison, thanks.

[@edmoore1661]

Wow! Nice job….keep up the good work and thanks!

[@panthermartin7784]

Sweet stuff, I went to a garage sale one time and the ol gal sold me a pail of WW2 .303 ammo. Like a 5 gallon pail full. Most of it has a black tip on them. Soon discovered there wasn't anything they wouldn't go through including the block of a Chev 350, like butter.

[@TheREALLibertyOrDeath]

That’s awesome 😎

[@pe.bo.5038]

.303 or .30-06🤔???????How would.303 AP get to the US;except you are Canadian???

[@panthermartin7784]

@@pe.bo.5038 You realize. 303 ammo is available on every continent on this earth right? You realize every ammo manufacturer in the US produced ammo for the .303 and many still do? Educate yourself, if thats not possible try google ffs.

[@pe.bo.5038]

@@panthermartin7784 🤡Dummy!I don't need your stupid lecture at all!-No,there for sure is no production of .303 AP in the US!-Not now;not in WW2In fact the ATF will take great interest in you,if you have these in your possession!🤢🤮

[@vadimsmolinets5848]

awsome content, keep it up love ur videos, very interesting and helpful

[@safetyshotgun308]

Just discovered your channel, and I have to say you have a golden voice, and I did not expect you to be so young when they camera turned to you!

[@eddiearchuleta615]

Man you gotta get some m855A1

[@hiderbear20]

I agree! Lol 🔫

[@tylermelson7489]

Where can one acquire some?

[@eddiearchuleta615]

Gunbroker I have acquired about 400 rounds

[@eddiearchuleta615]

M855A1 out of my 20 inch barrel chrono 3268 fps and put a hole in my 3/8 ar500 target at 40 ish yards

[@tydickson4021]

Yes

[@wes7580]

I was curious to see how steel core bullets compared to ball on steel. Awesome video!

[@jeffccr3620]

Bingo and I can't believe I have never thought about doing this test since I have so much scrap steel laying around outside my shop

[@garryb374]

The Soviet round uses a mild steel core and is not intended to be an armour piercing round. They (Soviets) have specific armour piercing rounds with hardened steel cores, but their ball rounds often have mild steel cores instead of lead.

[@lindafoxwood78]

1st time I shot my steel plate with my AKM - it blew a hole straight through. I recovered the penetrator, it was the exact dimensions of a US M16 .556 bullet! I was very impressed. My ammo was for the 1950's - Russian.

[@guardianminifarm8005]

Good test. Thank you

[@mobilegamersunite]

Great video thanks again

[@liamhernandez9329]

Awesome video!

[@ulflyng4072]

Very informative, Thx

[@dalegribble1560]

I looove that brass catcher!

[@nam430]

i have just learnt the use for the tiny rod of that tool thru this vid

[@finaltouchautodetailingllc]

Do love your videos man

[@JoeHTX]

I think the impact generates a lot more heat and higher temp than friction on the rifling does.

[@ru2yaz33]

It would be interesting to have included the 224 Valkyrie which has similar diameter and could be fired out of the AR 15 platform.

[@campion10]

I’m gonna say what you’ve surely heard many times before. That’s one hell of a voice you’ve got there. You could have a career in radio or voiceovers. I sure hope you can sing.

[@jacksin3323]

I harden and temper a LOT of steel, and to heat temper all the way through hardened carbon steel would take time@temp. Time and temp are a complex balance, so imma say that mushroom was soft steel. One way you can tell carbon content (in solution) is to... GRIND! The spark pattern of carbon steel is very "bushy". The stringers almost pop like fireworks. Low carbon or unhardened carbon steel sparks long stringers. You could always spark test the penetrator before and after shooting. See if something changed. Idk... either way, cool video. I never really see 7n6 and i was always curious how itd do against m855. Another fun video.

[@airair862]

👏👏👏👏👏👏👏👍❤ 7.62×54r steel core LPS. Barnayl -149gr TULA -150 GR. NPS -150GR. VS 7.62×51. 308 WIN BARNES - 168GR TTSX. 💪

[@kevinforesthill]

I'd love to see a show down between 140g .277 fury, 7mm-08 & 7x57.......the youngster, his older brother and their great grandad.

[@duke7052]

I'm new to your channel and I like how you just cut the bs and get right to the point. Subbed 👍

[@mattbrown5511]

I think I will stick with 7.62 X 39 MM and 7.62 X 51 Nato. However, great video.

[@unitedforcefitness6571]

Great content! It's looking nice and green wherever you'er at? It's still snowy here in Alaska.

[@darthsquidious215]

I suddenly feel less sad about 7n6 being no longer imported. Id like to see the difference between tula or wolf fmj x39 and soviet m43 x39. Though m43 is extremely rare in the US

[@manganvbg90]

Best thing was the cheap price…. Its corrosive though? So wouldnt touch it with my guns

[@BigSmartArmed]

7n6 has superior wounding mechanism and terminal ballistics to 5.56 over the entire flight path. It's a higher BC bullet with greater sectional density.

[@manganvbg90]

@@BigSmartArmed i meant over 5,45ball from tula

[@BigSmartArmed]

@@manganvbg90 While it was around it was the cheapest and the most accurate 5.45.

[@manganvbg90]

@@BigSmartArmed yes but corrosive and im lazy 😁

[@davidunderwood3605]

There is always the possibility that foreign steel insert ammunition sold over here to the public is not really a military production run but softer inserts specifically ment for civilian use and sale or the ones that didn't pass hardness test This is a good reason to disassemble a couple and test the hardness before being fired. If it's what their army is using then it still not a problem for them as it'll defeat boby armor which is it's primary use I'm assuming and seems to be better on chrony stats. And yeah better than so many peoples handloads including many of my own.

[@jeffreybean5363]

Great Ammo test 🇺🇸👊

[@scottdunn2178]

When the Farm to Market radio DJ makes ballistics videos 😂

[@TheDuckofDoom.]

Even anealed steel is quite a bit harder than FMJ. 60hRc is generally only brittle in steels wil a lot of chromium(eg martenistic stainless), sulfur or phosphorous(either as impurity or specifically for special uses needing easy machining)

[@MrSpudz2]

You do realize that 60hrc is how hard knives are…. That’s not annealed.

[@dustyak79]

Years ago I shot some mild steel with 7n6 never took the thickness it was old plate from a demolished bridge. But it appeared thicker than the thickest here. Some shots clean through some I was able to pull the penetrator out like in the video. I was impressed soley because the thickness of it .

[@ryanmcwhorter8501]

Hey - really cool video. A note on sample variance and standard deviation - these figures are not stable for low sample sizes. They converge to the population variance as you add more and more samples. But for 2 or 3 samples, those numbers are totally meaningless. You could go shoot 100 rounds of each and determine later that actually 556 had a better stdev than 545 (or vice versa). Really, they are downright misleading for sample sizes that low. Obviously its good that you're thinking in that direction though :)

[@DIREWOLFx75]

I don't know if you stated what range you're shooting at, but one idea for a potential additional test would be over a longer distance. The 5.45 is supposed to have blatantly better ballistics, so in theory at least, it should perform better at longer distance. Another thing if you have the opportunity, you could test "interference", something like a loose(so that there's at least potential for it to bend along with impact) and angled(to maximize potential for deviating the shot) piece of paper a few meters before the target plate, see if it makes a difference. As there has been quite some discussions about HV smaller caliber ammo being more susceptible to "terrain", ie foliage and worse.

[@weaponeer]

love to see 30.06 black tip AP tested

[@SubBubz]

Midway is awesome. Ordered some ammo from OpTiCs PlAnEt and it shipped a week later. Ordered some from midway like 3 days after that order shipped, shipped the next day and will arrive the same day the first order will. -.-

[@Sk0lzky]

Fun fact: currently used by post-soviet militaries 5,45 ap are different on steel between each other as well due to the fact they mixed 7n10 with new penetrators with old ones in the same boxes to fulfill quota. These rounds are still in circulation in huge amounts. It actually caused a major legal case (and deaths >

[@jmy7622]

I'd like to see some large caliber bullets that more play into the anti-material role or long range marksmanship that have a lot of juice behind them. It is interesting how the one you think will win ends up underperforming, you never know. Great video, very educational.

[@inertia14]

Great video but in that frame behind you with all of the different caliber rounds. There’s one that’s fallen off it’s perch. You don’t have to sort that out but my OCD would totally thank you 😅.

[@OhighoGrows]

Definitely wasn't 60 hrc or it would've shattered, I doubt the heat generated from the powder is enough to soften the tip. Not only does it take a high temperature (600+ degrees, depending on type of steel) but it also takes a fair amount of time, hours.

[@Reno86eNVy]

I liked the crosshair on the plate, have you thought of making a stencil you can lay down before you spray?

[@MTMILITIAMAN7.62]

The friction of the bore and air resistance can heat a high velocity rifle projectile to about 600 deg Fahrenheit, and while that will get lead nearly to its melting point, that is still well below the 2460-ish degrees necessary to melt mild steel. However, the impact generates an incredible amount of heat, if only for a very brief time period, and I imagine that is how you get deformation of your mild steel core. I think the steel in the M855 is hardened, and I doubt if it deformed as much.

[@olegakhapkin4318]

7N6M have hardened steel core. 7N6 - mild steel.

[@bananaballistics]

I wasn’t aware of an M designation, but that would explain it

[@kevo8630]

Broo just found this vid today and gotdamn son u need to go use that voice for some commercials or radio lmao 😂

[@deadparrothead3175]

I don't know if you were into any accuracy testing but it would be interesting to see if there's much of a difference with ball and rnds with steel cores. I've shot both and it really seems like "green tip" is significantly less accurate be it from a 1-8 and 1-7 twist barrels, which makes sense in my small mind, 2 different materials vs the 3 in 855. Ymmv. By the way great channel!

[@ghostmourn]

My thought is that 7n6 is not made for armor piercing characteristics. Rather the steel is just cheap, non toxic and any steel core is by law in the US considered armor piercing, even though its not. Lots of expensive Chinese rounds around with soft cheap steel that dont pen any better than lead.

[@veleriphon]

I would bet that the .545 insert lost temper during the impact event, rather than when it slid through the barrel. After all, it's not the fall that kills you, it's the sudden stop.

[@thedoomrunnerxl]

I bought 3 spam cans of 7n6 in the mid to late 90's, they were only $120 a can for 1080 rounds. Today the price is thru the roof. Kicking myself for not loading up on the cheap Russian ammo when I could back then. I hardly ever shoot my Overland Industries Bulgy AK74 SBR because I'm far too cheap to replace the ammo I'd use.

[@gussbuss4739]

so often i see ak to ar comparisons. with an 18 inch ar VS a Draco or something. thANKS!@

[@truebeliever8605]

To bad you didnt have 20inch barrel for both cals to test that. Thanks for the video

[@claudiovic9883]

Would love to see a M995 against these plates

[@masonlariscy9143]

It appears that what you have in your hand at the beginning of the video is regular mild steel 7N6, but in your thumbnail, you appear to have the hardened steel 7N6M because of the red band where the bullet meets the neck. Maybe you just had some of each? Still a great video btw

[@eloiseharbeson2483]

That red band denotes normal 7n6. Where do you get your information?

[@letsdothis9063]

All military ammo is sealed.

[@AKlover]

5.56 was designed for a 20 inch barrel 5.45 is actually pretty well optimized for a 16 inch barrel. Change the density of the base 5.56 FMJ projectile then change the powder to optimize for a barrel that is less than 20 inches

[@sa-amirel-hayeed699]

18.6 inch barrel in canadia goes brrrrrrr

[@hovolo88]

Hi just wanted to ask is that a spikes dynacomp on the AR ? How do you like it ? Also is it the short dynacomp or the full size one? I got the same m&p with a 16 barrel and want to get that break. Thanks.

[@dannypierce9528]

Would like to see it out of 20 inch barrel which the cartridge is designed for

[@_moffett]

I cant help but notice the bullet that is leaning in the framed bullet display

[@zackaryk2000]

20 inch barrel and that 5.56 will zip right through that 3/8 plate. This configuration will defeat IIIA reliably.

[@telurkucing5006]

Seems 5.45 7n6 dig deeper due to longer steel core compare to 5.56 but its not intentional made to perform like hardened penetrator for armour/barrier penetrating purposes due to its mild steel core

[@vaninec]

Most indoor shooting ranges not allowed mild steel ammo because of higher pen vs lead. That main reason why Soviets/Russians still make steel core ammo.

[@JD-fo3bx]

I would like to see you try the M855 out of a 20 inch barrel.

[@jamesd4013]

Awesome

[@mvxyzx]

Request: 5.56 NATO vs. 7.62x39. First clean steel targets and then with some bushes in front of the target. The evercontinueing debate about the 5.56 being vulnerable to foliage versus the 7.62x39 which (in some ppls minds) should bulldoze its way through everything....

[@gavindooly2375]

I imagine the original 20 inch barrel length of the AR platform would produce terrifying results with 5.56 since 5.56 was designed for a twenty inch barrel.

[@TheTGRproductions]

It does! It's really good at penetrating with a 20-inch barrel. I've had the pleasure of testing one out with M855A1 ammo, and it's a little monster! Personally, I'm more of a 7.62 x 39 and .308 kinda guy. But credit where credits due, the 5.56 shines in a 20-inch barrel!

[@eloiseharbeson2483]

Pull the projectiles from both rounds. You will see that the pills are nearly the same length. The 5.56 projectile just sits a lot deeper in its case. TBH it is surprising to see anyone burning up their 7n6 these days.

[@user-zv4fz5ne3g]

Интересно увидеть тест на пробитии на 300 метрах,ведь за счет болистического кофециента 5.45 догоняет по скорости 5.56,и вот на таком расстоянии замерить бы пробиваемость)

[@okakokakiev787]

Мне кажется он нигде не перегоняет энергии у него меньше

[@user-zv4fz5ne3g]

@@okakokakiev787 и что ,что меньше,у 45 аср энерги дохрена,около 700 дж,но он не летит далеко по сравнении с пулей тт у которой 500 дж ,и пуля тт уже на 30 м догоняет 45 по энергии,знаешь почему?правильно,из за лучшей обтекаемости.это и есть лучший болестический коэффициент.Так и пуля 5.45 догоняет через 300 м 5.56 по энергии и скорости за счет лучшей обтекаемости.Набери в интернете -,,болестические таблици пуль,, и там ты все увидишь,на каком расстоянии пули теряют скорость и энергию.Скажу тебе больше,через 500 м пуля 5.45 по энергии обгоняет да же пулю от 7.62-39

[@socican]

you should have tested the 7N10 cartridge, newer and with increased performance, which has become standard since the 90s

[@TheCowboyfromhell87]

Send him your ammo

[@bananaballistics]

I’ll have to look into that one

[@HenrikSherwood]

7n10 is super rare in the US

[@gator3-234]

I swear this guy should be narrating for Motortrend.

[@intellectualiconoclasm3264]

It's my understanding that 7n6 uses a mild steel penetrator for the most part.

[@njw1977]

I bet the air pocket in the tip of the 7N6 had something to do with the penetration on the steel.

[@bananaballistics]

It does seem to have a large air pocket

[@eloiseharbeson2483]

That pocket does nothing on steel. Its purpose is to make the projectile more butt heavy so it tumbles quicker in soft tissue.

[@njw1977]

​@@eloiseharbeson2483That was my point.....

[@julianeder4699]

Would be interresting to see a .243 tested against similar rounds. I forgot the name of the video but someone tested a plethora of different rifle calibers vs steel and the 243 was the only one besides the .50 bmg that managed to punch a hole something not even the mighty 338 lm managed to do. The target the guy shot in the video was danglin from a chain tho so some of them may not have hit at a good angle a problem your setup doesnt have

[@johnmcclain3887]

Energy transfer is far greater when the target is solidly mounted. Live combat always demonstrates that fact. That 243 definitely has the velocity advantage.

[@julianeder4699]

@@johnmcclain3887 that plus a very slim profile. Biggest issue i saw in that video i mentioned was that he didnt even wait out the time to let the plate stabilize again. Thats why i like this channel here same parameters for every round fired

[@johnmcclain3887]

@@julianeder4699 I suspect we find ourselves on many the same channels, I've been retired just since this plandemic, and too much time on my hands. They killed my machine shop.

[@johnmcclain3887]

There's also the factor of the plate able to move, and substantial force transferred in plate movement rather than moving the metal in the discrete striking zone.

[@julianeder4699]

@@johnmcclain3887 Wouldnt surprise me once one starts goin down the firearms rabbithole on youtube its only a question of time till you see a collab between a big guntuber with a smaller channel or another video on a certain type of round. Think my journey started back in the FPS Russia/ early Demo ranch days but just like in your case the pandemic inevitably lead to a bunch of boredom and a reinvigoration of my interrest in firearms especially since guns are a rather sensitive topic in my country of origin. As for the bullet striking the plate and the latter giving way to the impact via means of bein pushed backwards instead of letting the projectile pass through i sadly dont really understand how much it effects the performance of a round as most slow mo cameras on youtube slow down time only to a max of a 10th of the real life speed which is nowhere near enough to draw reliable conclusions on the subject. Ive seen a ton of comments on the subject especially on the channel goin ballistic aswell as theories on how spacing the plates apart could alter the outcome significantly but most of them just threw a bunch of numbers arround that my brain simply couldnt comprehend. That bein said the more randomn parameters one can eliminate in their testing environment the more clear cut the results get and the immobile nature of mr bananas setup, him settin up the plates at a 90° angle aswell as the grinding and precise measurements bein done afterwards most definitely eliminate a lot of the factors that could make a rounds performance deviate from the norm. Oh and enjoy the pleasures of retirement ive still got myself a good 3-4 decades before i can hang up my boots

[@garysgarage.2841]

The LED bullet would melt before enough heat generated would effect the steel insert.

[@skullofserpent5727]

AP 5.45 next please.

[@whomagoose6897]

Using a similar sizing name between these two cartridges is important for comparison. The 5.56 NATO is 5.56x45. So compare 5.65x45 with 5.45x39. One cartridge has noticably more propellent and more mass of a bullet.

[@harrypeterson9287]

5.56 has a case capacity of approximately 28.5cc while the 5.45 has a case capacity of 27cc, pretty close. The 5.45 case is shorter but slightly wider. The bullet weights run similar as well. I'd say the biggest difference is the peak pressure limit with 5.56 being significantly higher.

[@mecadragoon]

what do you do with the steel plates afterwards?