Converting 223/556 brass to 300 Blackout

[44Blam]

So, I pick up brass from my local range and the newbies with their AR-15s tend to leave a lot of brass.

I recently got a 300 BO upper and started converting brass. What I noticed is that most brass thickness for .233/5.56 is about 0.011". BUT Wolf ammo is 0.015"...

Turns out, if I make 300 BO brass out of Wolf 223/556 it will NOT chamber in my rifle. Amazing what 8 1/1000 ths of an inch will do. It was a great annoyance since I happened to choose a wolf case for my "dummy round". Then I happened to choose another case that I cannot tell who makes it as my second "dummy round"... Well dummy round 1 will not chamber no matter what and dummy round 2 is fine. Dummy round 2 case thickness is 0.011" as is most of the brass I found.

This involved a bit of head scratching, some cursing a few bouts of pulling boolits and resizing cases...

Maybe this saves y'all some head scratching and cursing. ;)

[JimB..]

There is a list of 5.56 and .223 brass by brand indicating which work best for this conversion.

[Conditor22]

Good brass for converting
ADI PERFECTA
Aguila PMC
A USA PS
FC PSD
GFL RA
HB RP
Hornady SSA
Hornady (nickel TAA
IK03 Tula
IMI TW
IVI TZZ
LC WCC
M193 Winchester
Norinco WIN NT
NOSLER WMA 15



Thick neck wall, bad without neck turning:

AB 556 L2A2
ATI MKE13
CBC MPA
CJ6 Norma
CJ 8 NPA
DNL PMC
FNM PMP
FRONTIER PPU
GECO RAM
Hot Shot RORG
HRTRS RWS
ICC S&B
IK03 SADU
IMI TAA
IVI SADU
KFA Wolf Brass

[Lloyd Smale]

problem is 556 brass is all over the place in thickness. What feeds in one of my ar15s wont feed in the other two and the ruger american is tighter yet. What helps is running them through a bulge busting die then small base sizing and i size all my cast bullets to 308 for the blackout. Anything larger wont go into the american and even then it takes some effort to close the bolt. Proper solution would be neck turning all the brass but ive got probably 10k loaded up and im not going to turn that many necks. So if you want them to run in every gun look at conditors list and keep the rest for 556 or start turning necks or do what i do and live with it.