When loading ammo for an Ar-15, I like to test a range of powder charges to see what groups the best, in case it makes a big difference.
For CQB (short range) we don't need a lot of power to punch a hole in the paper, and bug hole accuracy is not needed either. What is important is reliability. If you down load too far, the bolt may not lock open and maybe the rifle won't cycle.
Today I ran a test on a NEA 14.5", using Hornady 55gr FMJ bullets over 4895. (19 to 24 gr)
As a control, I shot a group with Norinco yellow box ammo. It was terrible. Cycled just fine, but a huge group. I do not know if this is indicative of all lots of this ammo. I also shot some Norinco 45ACP today. It shot very well.
For CQB (short range) we don't need a lot of power to punch a hole in the paper, and bug hole accuracy is not needed either. What is important is reliability. If you down load too far, the bolt may not lock open and maybe the rifle won't cycle.
Today I ran a test on a NEA 14.5", using Hornady 55gr FMJ bullets over 4895. (19 to 24 gr)
As a control, I shot a group with Norinco yellow box ammo. It was terrible. Cycled just fine, but a huge group. I do not know if this is indicative of all lots of this ammo. I also shot some Norinco 45ACP today. It shot very well.
