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Old June 30, 2013, 06:06 PM   #6
IDT
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Join Date: November 6, 2011
Posts: 48
]Today, I conducted another chrony test. This time, I was using the 50gr Hornady V-MAX.

The Ammo
50 grain - Hornady V-MAX Polymer Tip Boat Tail
Case Trimmed length - 1.746" (Presized)
Overall Length - 2.240" (after sized and seated)
Powder - Alliant's AR-COMP
Primers - CCI 400
Weapon platform - 16" RECCE Barrel in 5.56 with a 1:8 twist (Suppressed)

Batch 1:
23.5gr of AR-COMP Powder
Shot 1- 2825
Shot 2- 2826
Shot 3- 2798
Shot 4- 2839
Shot 5- 2835
Shot 6- 2776
Shot 7- 2798
Shot 8- Chrono Error - data discarded
Shot 9- 2791
Shot 10- 2856
Average ft/s on Batch 1 = 2816ft/s with a standard deviation of 26.32


Batch 2
24 grains of AR-COMP Powder
Shot 1- 2926
Shot 2- 2894
Shot 3- 2901
Shot 4- 2891
Shot 5- 2906
Shot 6- 2913
Shot 7- 2895
Shot 8- 2905
Shot 9- 2889
Shot 10- 2880
Average ft/s on Batch 2 = 2909ft/s with a standard deviation of 29.40


Batch 3
24.5 grains of AR-COMP Powder
Shot 1- 2967
Shot 2- 2916
Shot 3- 2958
Shot 4- 2948
Shot 5- 2924
Shot 6- 2911
Shot 7- 2953
Shot 8- 2968
Shot 9- 2944
Shot 10- 2899
Average ft/s on Batch 3 = 2938ft/s with a standard deviation of 24.55


Batch 4
25 grains of AR-COMP Powder
Shot 1- 2982
Shot 2- 3017
Shot 3- 2023
Shot 4- 2987
Shot 5- 2974
Shot 6- 3025
Shot 7- 2995
Shot 8- 2985
Shot 9- 3013
Shot 10- 2972
Average ft/s on Batch 4 = 2997ft/s with a standard deviation of 20.39


Batch 5
25.3 grains of AR-COMP Powder
Shot 1- 3029
Shot 2- 3046
Shot 3- 3049
Shot 4- 3046
Shot 5- 3052
Shot 7- 3049
Shot 8- 3032
Shot 9- 3039
Shot 10- 3033
Average ft/s on Batch 5 = 3042ft/s with a standard deviation of 8.256

It is interesting that the instant I broke and maintained the 3,000ft/s mark on batch 5, the standard deviation tightened up TREMENDOUSLY. This tells me that this is my most accurate round when I go to the range. The others had too much of a deviation to be "the" accurate load for this round.

Thoughts?
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