High Volume Course Observations

[LRRPF52]

A question about "Rapid shot string placement at 7yds was about twice that of .223, due to recoil, but still well within the A Zone on IPSC targets."
To clarify more time was used to stay on target or re-acquire the target due to more recoil in a Grendel? Would a muzzle brake that compensated for rise or muzzle displacement speed up Grendel times? Perhaps other recoil management options like different stocks?
Very interesting post, thanks!

Sorry I wasn’t clear. I meant to say "group size" of rapid strings was twice that of .223 Rem at 7yds, and I edited for clarity. Time wasn’t that much different.

This should come as no surprise when shooting 100gr vs 55gr projectiles from the same rifle/carbine/pistol.

Yes, you could really tame the already mild recoil with a brake, but this also increases muzzle blast for those around you in close quarters.

A suppressor is preferred for that, which will still exhibit more of a push since it acts as a pressure accumulator at the muzzle.

I plan to test 90gr in a CQM setting next time I do a CQM course. In my experience, even from really lightweight barrel Grendels, 90gr TNT and 95gr Lehigh Defense CCs feel almost recoilless.

It’s still a lot better than a 7.62x39 AK shooting 123gr at lower chamber pressure, which is more of a testament to the AR15’s operating system and in-line design.

I’ll have to try it with my LaRue 18” Stealth 2.0 Grendel as well as my 12” Monster barrel build pistol suppressed.

The LaRue Tranquilo brake isn’t that obnoxious compared with a lot of other gilled brakes, and the barrel is pretty stout.

One of the guys did the 1-5 drill for his first time with the 12.5” BA barrel suppressed in under 4 seconds, which is a good run for that drill cold turkey. He even got all his counts correct.

You shoot 15 shots rapidly at 3 different sils, starting with 1 on the left target, 2 in the middle, 3 on the right, 4 back on the middle, and 5 on the first.

Most people never get the count right out of the gate. I can go for months or even over a year and not shoot that drill, and break under 3 seconds out of the gate with 5.56. I shoot it in my head and simulated every now and then. It’s good for getting your splits down between targets and keeping the gun on-target with escalating rapid string round count.