How To Convert 223/556 Brass to 300 Blackout - Jig, Trim and Cut Length, Conversion

In this video I'll show you how to convert your 223/556 into 300 Blackout quick, easy, and inexpensive.
Make sure to check out my Rumble channel:
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Mini Miter Cut-Off Chop Saw
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300 Blackout Jig
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#reloading #300blackout #firearmseducation

[@andrewword5770]

Hey man, thanks for putting this out there. Quick question for follow-up or future edits: If you're going to make any revisions/updates on this video, would you also recommend annealing cut-off brass before resizing to 300BLK? I know it's not always necessary if you're going for quick and easy, but it might be important for reducing split necks when converting it to a new size and extending out case life.

[@k2defense]

Hello Andrew Word! My process is to cut the brass, anneal, resize. If you ask 10 reloaders, you might get 10 varying answers. My suggestion for you is to test out different ways and find what works for you. Most will say you get better neck tension when you anneal then resize. Hope this helps! I’ve pinned your comment so others can chime in and give their opinion as well. Thanks for the question/comment!

[@andrewword5770]

@@k2defense Thanks for the feedback. I've been reloading for about 7 years now, but I'm continuously seeking out knowledge in reloading. It's when we think we know everything already, that we become dangerous to ourselves and others. Cheers!

[@k2defense]

@@andrewword5770 keep reading and watching videos. I keep my reloading manual by my bedside right next to my Bible. Read, then reread. Their both good for the soul. Keep safe out there!

[@andrewword5770]

@@k2defense Amen, isn't that the truth. 😆I've found that you may ruffle some feathers if you keep the wrong reloading manual (or Bible) next to your bedside. Happy shooting amigo! May your groups be small and your cases never rupture!

[@k2defense]

Andrew Word - love it! 👍🏻

[@Heisenbrick]

Fantastic no nonsense video! So excited, I just started reloading and plan to do this soon.

[@k2defense]

@Heisenbrick - appreciate the comment! 👍🏻

[@drjamescarren]

FYI not all brass will work, some have too thick case walls and will cause chambering issues. For example Wolf 223 brass is no good. I typically use FC, LC or RP, SB head stamps.

[@TNDOGGY]

my FC bulges my case necks for me...frustrating

[@truthslayer9653]

If the cut length is slightly larger than the C.O.A.L use a Lee 300 BO trim guage and trim to length before following on to the creating the neck stage. If you dont you can have feeding problems!!

[@drew55974]

FYI for best results do not use psd,or wolf cases

[@mrbigsdaddy]

i noticed you didn't anneal. Should we do that b4 running through the die? Unnecessary? looked smooth. Short sweet well done video. Thanks

[@mrbigsdaddy]

sorry, I should read the pinned post first!

[@k2defense]

@mrbigsdaddy - make sure to subscribe and turn on your notifications. I’ll be dropping more videos on this topic soon! 👍🏻

[@k2defense]

@mrbigsdaddy - no worries! 👍🏻

[@wolfdogg6658]

good video. thank you

[@DF-DefendFREEDOM]

You left out the step to trim the neck due to the walls of the 5.56 cases being different thickness depending on head stamp, which becomes the neck walls, thereby causing chamber jambs especially in match grade barrels. A Hornady neck trimmer may be employed to resolve this issue. A .0135 wall thickness after trimming has served well for the last couple years to prevent chamber jambs. Recently found a video on the subject by Ultimate Reloaders as well.

[@k2defense]

@DF-DefendFREEDOM - go to 2:30 in the video. Where I find chambering issues is with the headspace. Ramp feed issues are also common. To thwart off ramp feed issues, apply a light crimp. Chambering issues, dial your die down and either use a depth gauge or use your rifle to see if it cycles appropriately. Hope this helps! 👍🏻

[@LS-vl8gu]

​@@k2defensewhat he is referencing is totally than trimming overall length. He's referencing neck wall thickness. Which can be an issue in forming brass to be chamberings.

[@k2defense]

@LS-vl8gu - ok, now I’m trackin’. Yes, the 5.56 case will be thicker than the .223 case which will need to be trimmed down a bit. I totally blew by that. Great catch to both of you!!! 👏🏻👏🏻👏🏻 Appreciate you clarifying this for the audience and me! 😊👍🏻

[@amateurastronaut5006]

Do you have a list of all devices needed? Maybe an Amazon list link or something?

[@k2defense]

Send me your contact information to [e-mail] 👍🏻

[@spytye1]

So is annealing necessary after cutting these down?

[@k2defense]

@spytye1 - great question! I’ll be releasing a video on annealing here hopefully soon. If you’re not using a full length or SB die, you probably don’t need to anneal. However, if you’re looking for more accurate and reliable reloads, annealing might be your best bet. Hope this helps! 👍🏻

[@vintagetintrader1062]

I have seen someone making 300 BLK from 223 to 300, after the first fire of the resized case, the case will fire-form to chamber then be too short. If allowing for this, how much extra can you leave on the case length until it causes chambering issues? I thought about making ‘rough’ first initial plinking subsonic rounds using cheap round nose bullets designed for 30 cal. Then after first fire resizing correctly. I only have a bolt action so not worried about driving a gas system for a AR. So much info for 300 BLK is for the AR guys, if only bolt action (or some of the new lever actions now in 300 BLK) does not apply

[@k2defense]

I’m not sure I’m following. So your friend converted .223 cases into 300 BLK cases, the 300 BLK case was resized. After resizing the case was trimmed to spec, then reloaded the case. He shot that cartridge and then it shortened? If so that shouldn’t be an issue since resizing will lengthen the case. I assume you’re using SB dies?

[@vintagetintrader1062]

@@k2defense Size was perfect after cutting, but when checking after first fire. The some of the cases was shorter I think from the case fire forming to chamber? The brass must spring back when forming with some brands?

[@k2defense]

Hmmmm… the only time you measure your brass is after depriming and resizing. So, what you’re telling me is that the cases are at spec length when reloaded and they get shorter after shooting. My question is, what is the length of the case after resizing. Hope all this make sense. 👍🏻

[@barman882007]

Ensuring your securing your jig to table

[@k2defense]

Yessir! 👍🏻

[@muleskinner2226]

Do you chamfer and de bur before you size them?

[@k2defense]

I usually chamfer and deburr after resizing and trimming. Resizing causing lengthening of the case so I always trim after the resize. Hope this helps 👍🏻

[@muleskinner2226]

What about the burrs from the saw cut, do they build up inside your sizing die? I am reluctant to put them in my die with the jagged edge from the saw. @@k2defense

[@k2defense]

@@muleskinner2226yes, that’s a great point. Definitely wouldn’t hurt and to your point help extend die life. Great observation! 👍🏻 thanks for bringing that forward!