300BlkTalk

I developed a load for my AAC 16" 300 BO upper that grouped under 2" @ 100 yds. this past summer. It's 11.1 gr. 1680 under a 225 gr. Hornady BTHP. Good feed, bolt held back on last round, no problems. Today, only 1 out of 5 would feed, and it was all over the place. Is 1680 fickle when it ...

I wish I had found this website and thread before I converted 200 rounds of mixed brass. Didn't start looking for answers until I ran into a bunch that would not chamber during load development. Had to beat the action open.