223 and 357 sig brass and hodgdon universal

I guess so, am not familiar with how the 300 rd is made.

Me either, I've never even heard of that particular round. I know one thing, it's going to suck to have a brand new AR and not be able to shoot it because of no ammo. Oh well, I guess I can always beat a jack booted thug over the head with it if I have to.
 
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