Loading in bulk for AR type rifle.

[sammy]

Hello all,

I have 3000 Montana Gold 55 grain FMJ's and lots of 748. I have found that my rifle likes 26.5 grains of 748.

I have been collecting .223 brass of many different head stamps and would like to just load them without separating them. Using a medium load do you think it is safe to do this?

[XDRoX]

Sure. Completely safe.

[GeoffLinder]

Yes, 26.5gr 748 will be safe load in any brand case for any AR with 5.56 or .223 Wyldie chamber. Load to 2.230" to 2.240" OAL for 55gr. Or, if bullet has cannelure, just seat so cannelure is centered on case mouth and as long as OAL is not below 2.220" you should be good to go.

FWIW, I use 27.5gr 748 under 55gr FMJ with OAL at 2.235". In my 1:9 AR 27.8-28.0gr is where I start to see pressure sign at that OAL. YMMV

[sammy]

Great, thanks guys.

Does the .556 case have less volume than a standard .223 case?

[skibuff]

If your AR is chambered for .223 you might have problems. If its chambered for 5.56 you should be good as long the load is safe.

[Colt562]

that sounds right, just make a few head out to the range and test them.

[sammy]

If your AR is chambered for .223 you might have problems. If its chambered for 5.56 you should be good as long the load is safe.

I am loading for a Rock River 16" Wylide (sp?) chamber and a LMT 16" .556. Shooting the same ammo out of both rifles the Rock River flattens the primers much more so than the LMT. Not a complaint, just an observation. The LMT does seem to have an accuracy advantage.

[LexLuther]

"Does the .556 case have less volume than a standard .223 case"
You have the google right?

[LexLuther]

[Seesm]

Depending on my powder I use 24.5 to 26.0 is where I am at on my loads...