Hey all I need some guidance
I just finished an ar308 build and I'm having pressure issues I'm using a Criterion barrel (m110 contour) 20in. Rifle length gas system and a ADK bolt... Bolt and chamber ext. DPMS compatible. I've got about 40 rounds through it. I started with some hand loads that 42.8 grains of varget fed brass and 175gr. Berger otm tactical bullets at 2.80 col I got ejector pin marks and cratered primers so I decided to use factory ammo and I used federal gold medal match 168gr at 2.80 in still got cratered primers and very slight ejector pin marks. I realize these are signs of over pressure but with fgmm 168's this shouldn't be happening do you have any ideas you can send my way .... Could this be a headspace issue...... Confused!!!!