Fastest 75 grain HPBT .556 load out of a 16" M4
- Thread starter AZgeek
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Hit 2730 with 24.2gr of TAC. I never ended up using that load but plan to retest it before the next match season starts.
Western Powder's load guide says max 5.56 load for TAC and a 75 hpbt is 25.8 grains. Listed velocity of 2994 is for a 24" barrel, but should still be scooting along pretty good from a 16".
Other than western powders, Nosler is the only others I know of that publishes 5.56 data, but theirs is far more conservative with none of the loads topping 2700 for from a 20" barrel.
Other than western powders, Nosler is the only others I know of that publishes 5.56 data, but theirs is far more conservative with none of the loads topping 2700 for from a 20" barrel.
In my 16" recce setup (223 Wylde chamber, 1:8 twist) with LC brass and CCI 450 primers both TAC and AA2460 were able to push the Hdy 75gr BTHP to ~2830 fps at or a little less than Western Powders' 5.56 load data (I decided 25.3gr of TAC was max in my rifle, for right at 2830 fps). Seating depth was 2.250".
I didn't get the accuracy I was looking for at those speeds though, and settled on 23.4gr of Benchmark for 2685 fps with the same bullet.
For reference, the same bullet in Hornady TAP ammo does 2630 fps in my rifle.
Hope that helps!
I didn't get the accuracy I was looking for at those speeds though, and settled on 23.4gr of Benchmark for 2685 fps with the same bullet.
For reference, the same bullet in Hornady TAP ammo does 2630 fps in my rifle.
Hope that helps!
Thanks guys. Really do appreciate the help. Heading out today to do some velocity testing. Going to focus on using TAC and CFE223 for now. I'll let you know the final results. We at Gila Defense Systems have already delivered the best combat pistol round in existence to SOCOM. You can review their 2017 test results on our website:
http://www.giladefensesystems.com
Of no surprise to me, SOCOM did not test our 9mm against Kevlar/Dyneema base body (soft) armor/helmets/shields, bullet-proof glass or tires. I wonder why LOL?
http://www.giladefensesystems.com
Of no surprise to me, SOCOM did not test our 9mm against Kevlar/Dyneema base body (soft) armor/helmets/shields, bullet-proof glass or tires. I wonder why LOL?
So had a chance to test both CFE223 & TAC yesterday. I took eight shots of each starting 24.8 grains and finishing at 26.2 grains using a Magnetospeed v3. The bullet was Hornady 75gr HPBT with a COAL of 2.240 out of a 16" M4.
TAC was the fastest finishing at 2878 fps. CFE223 finished at 2826 fps. Brass looked good but the primers were cleary on the flat side at the top of the range. Going to re-shoot 5 more with TAC loaded at 26.0 grains (which is .2 over the published max load of 25.8) to make sure I consistently get around 2866 fps.
If that holds up, I'll then work my way down using CFE223 with a target velocity of 2315 fps so I can simulate hits/energy on target at 300 yards but actually shooting at say 10 yards. Do you guys think I would be in danger of getting a bullet stuck in the barrel at that low speed?
TAC was the fastest finishing at 2878 fps. CFE223 finished at 2826 fps. Brass looked good but the primers were cleary on the flat side at the top of the range. Going to re-shoot 5 more with TAC loaded at 26.0 grains (which is .2 over the published max load of 25.8) to make sure I consistently get around 2866 fps.
If that holds up, I'll then work my way down using CFE223 with a target velocity of 2315 fps so I can simulate hits/energy on target at 300 yards but actually shooting at say 10 yards. Do you guys think I would be in danger of getting a bullet stuck in the barrel at that low speed?
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