Welcome to CastBoolits Jdutton24
It sounds like you'll get along great with us reloading addicts.
Love 300 AAC subsonic, no hearing protection required. I prefer shooting a single shot, it saves on ammo
Just make sure the powder-coated boolits pass the smash test (smash the boolit on an anvil or chunk of steel with a hammer or? and if the coating doesn't chip or flake off you have covered your bases for the best possible result with PC.
Just got done converting a bunch of 223 brass into 300 AAC (there are several brands of brass that are to thick so do your research first)
Headstamps you may want to avoid:
ATI , PMP, CJ, NPA, PPU, MKE, S&B, FNB, FNM, S&B, IMG, RORG, RWS, TAA, CJ, Amerc, PRVI, HRTRS, KFA.
I found that almost all factory (once fired) brass cases are short, thinner and inconsistent in length.