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Old June 27, 2013, 04:06 PM   #1
IDT
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.223 load workups - anyone do it this way?

Had all intentions of using the chrony today.

Loaded up 4 test batches of ammo last night :

All had the following specs except for the powder grain:

Bullet: 55gr HP Flat Tail (Generic Brand - Full jacket)
Case trim length - 1.746 (pre-sized)
C.O.A.L. - 2.222
Powder - AR-COMP
Weapon platform: AR-15 - 16" RECCE Barrel - 1:8 Twist - Mid Length Gas System - Suppressed (yes, I'm testing with a suppressor as that is how I shoot)

Batch 1 @ 24.5gr
Batch 2 @ 25gr
Batch 3 @ 25.3gr
Batch 4 @ 25.5

10 rounds per batch

At the 25.5 mark, it was a true compression load and I stopped.

But waking up this morning proved difficult, and it's still pouring the rain down - and I don't feel like toting everything to an indoor range and using the light diffuser on the chrony. So, this test will have to wait.

I'm going to load 4 batches with Hornady V-Max in 50 grains today starting at 22 grains and working up to 24.5...unless anyone has data for AR-COMP that says I'm at the max for those. There is surprisingly little data for AR-COMP yet, even on loaddata.com and even less for the lighter bullets.
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Old June 28, 2013, 03:00 PM   #2
rduckwor
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If it works for you, do it. I work up on an outdoor range and do it differently. All that matters is that we get the result we are seeking.
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Old June 28, 2013, 11:04 PM   #3
NESHOOTER
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Did you COAL grow? have you measured them under a compressed load.
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Old June 28, 2013, 11:11 PM   #4
steve4102
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Quote:
I'm going to load 4 batches with Hornady V-Max in 50 grains today starting at 22 grains and working up to 24.5...unless anyone has data for AR-COMP that says I'm at the max for those.
Use Alliant's 52gr data.

http://www.alliantpowder.com/reloade...5&cartridge=46
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Old June 29, 2013, 04:00 PM   #5
IDT
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Posts: 48
Quote:
Did you COAL grow?
Not exactly sure what you mean here... I trim all of my cases before I size & de-prim/prime - a process that changes, slightly, the case length. The COAL is from the tip of the bullet to the bottom of the case.

Also - My results are in from my chrony shoot: (only shot 6 rounds per batch as the sky was about to open up and **** on me again)

Batch 1:
55gr HPFT
C.O.A.L. 2.222
25.3grs of AR-COMP Powder
CCI 400 Primers
16" RECCE Barrel in 5.56 with a 1:8 twist (Suppressed)

Shot 1 - 3039ft/s
Shot 2 - 3028ft/s
Shot 3 - 3027ft/s
Shot 4 - 2995ft/s
Shot 5 - 3028ft/s
Shot 6 - 2984ft/s

Average ft/s on Batch 1 = 3016 ft/s

Batch 2 = same except 25.5 grains of AR-COMP

Shot 1 - 3001ft/s
Shot 2 - 3004ft/s
Shot 3 - 3033ft/s
Shot 4 - 3049ft/s
Shot 5 - 3059ft/s
Shot 6 - 3091ft/s

Average ft/s on Batch 2 = 3039 ft/s

I had doubts about using AR-COMP on the lighter bullets, but it looks like I'm good to go. I can maintain an excess 3,000 ft/s from a 16" barrel (Suppressed) with the lighter 55 grain rounds - and that is frigging awesome for the longer distance shooting.
The primers are seated perfectly. There is zero issue there at all.
None of the cases appear to be deformed, or neck split or otherwise out of shape. I'll be putting them on the micrometer in a few and measuring the before and after trim length for the cases. It will be interesting to see if they grew. This is a 5.56 barrel...so I'm not sure what to expect there. But visually, they look great.

EDIT: - Just measured the spent brass. The original trim length was 1.746" What I didn't expect was to get a shorter case length... They measure out now at 1.743". Obviously this could be accounted for in 2 different ways of measuring the brass, and I can assume to say there was zero change in the length. However I fully expected to see SOME growth... What gives?

Last edited by IDT; June 29, 2013 at 05:47 PM.
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Old June 30, 2013, 06:06 PM   #6
IDT
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]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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