Hello all. I've been lurking on here since I started casting several years ago and have learned a ton. But the one round I cannot get to shoot accurately is a heavy 300 blackout subsonic load. I've tried the controversial lee 230gr and have recently tried a NOE 311-242-FN. After trying both in just about every load variable I know, I can't get below 3.25 MOA @ 100 yards. Is this as good as it gets with these missiles? Definitely not looking for sub-moa, but 2 MOA would be nice. I've searched this forum as well as 300blktalk and havent found a definitve answer. I need help from the Boolit masters. Been chasing this issue for over a year on and off.
For starters I'm using :
8.5" 300 blackout radical firearms upper 1:7 twist
YHM resonator suppressor
either a 100% COWW or 50/50 COWW/SOWW boolit (accuracy hasnt changed appreciably)
Accurate 1680 powder anywhere from 10.8-12.2 grains
Powder coating the boolit nose down as well as nose up
Seating depth from 2.180-2.250
Sized to .310 with a reamed lee sizer (slugged bore is ~.3075-.308)
No gas checks
Light crimp to remove case flare from Lyman M-Die
What did I miss?