01-18-2020, 04:57 PM
For the AR15 and its floating firing pin, you want the thicker cup Small Rifle Primers using Lapua, Hornady, Norma, Nosler, Federal, Starline, the new PPU (old used LRP), and Remington Grendel brass.
![[Image: calhoonprimers02.png]](http://accurateshooter.net/Blog/calhoonprimers02.png)
I've personally used Rem 7 1/2 BR primers, as well as some of the CCI 450s.
The reason for using the thicker cup primers is to prevent any slam-fires that can happen with thinner primers on a hot day, especially if you chamber with the muzzle down (more carrier inertia).
I've personally used Rem 7 1/2 BR primers, as well as some of the CCI 450s.
The reason for using the thicker cup primers is to prevent any slam-fires that can happen with thinner primers on a hot day, especially if you chamber with the muzzle down (more carrier inertia).
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com