08-15-2018, 01:19 PM
If your using standard rifle primers like CCI 400, Winchester or Remington standard primers you can get pierced primers in an AR-15 because the primer cups are thinner. It is recommended to use CCI 41 or Federal AR primers which have thicker cups and designed for the AR-15 floating firing pin. The CCI 450 and other magnum small rifle primers have thicker cups as well as a couple of bench rest primers.
There have been threads where a bolt length or firing pin were out of spec and have contributed to pierced primers or inconsistent ignition. I wish the other bolt manufacturers had used the 2.810 length bolt for 6.5 Grendel but they didn’t. When you move away from the 5.56/223 in the AR-15 into other calibers/cartridges there are inconsistencies in components.
There have been threads where a bolt length or firing pin were out of spec and have contributed to pierced primers or inconsistent ignition. I wish the other bolt manufacturers had used the 2.810 length bolt for 6.5 Grendel but they didn’t. When you move away from the 5.56/223 in the AR-15 into other calibers/cartridges there are inconsistencies in components.