Anyone had any luck with 129 SSTs and ARComp? My Hornady manual does not list the powder. I see BL-C2 gives good speed with itin the manual.
6.5 Grendel Preferred Loads
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Originally posted by Hermosa65 View PostFolks,
Here are my latest results from my 6.5 AR. It has a 22" upper from Stryker Machine and Tool based in Winston Salem, NC. Using CFE223, I was averaging 1 - 1.5 MOA. With AR-Comp as per the picture below, I was able to get sub-MOA on 3 groups 0.69 - 0.95. Below is the .69 group. No signs of pressure.
Alexander Arms Brass
WSR Primers
27.5gr AR-Comp
123 Hornady ELD
2.257 COAL
[ATTACH=CONFIG]10906[/ATTACH]
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I'm doing some workup with Sierra 107TMK bullets. Here's my ARComp results to share.
Sunny and 45degrees out, Sierra 107TMK, ARComp powder, 2.255 COAL, new Hornady Brass, CCI 450 primers.
Chronograph used is a magnetospeed V3, groups were shot with bipod and rear bag, chrono not attached.
Rifle is a spare parts build with 18" Satern Barrel, Maxim bolt, Omega supressor, and adjustable gas block, nothing too fancy.
**THESE ARE MY LOADS FOR MY RIFLE AND MAY NOT BE SAFE FOR YOUR RIFLE SYSTEM. USE AT OWN RISK.**
All velocity strings were 5 shots.
Groups were 5 shots and measured edge to edge and then subtracted bullet diameter.
No flattened primers during any of the shots.
Slight ejector swipe on three pieces of brass at the 28.4 grain charge.
Going to try 8208 powder next and see what I can come up with.
27.6 grains - Max 2547 - Min 2527 - Avg 2536 - SD 7.4 - Group size .53"
27.8 grains - Max 2551 - Min 2542 - Avg 2546 - SD 4.0 - Group size .59"
28.0 grains - Max 2567 - Min 2545 - Avg 2559 - SD 8.7 - Group size .78"
28.2 grains - Max 2590 - Min 2579 - Avg 2584 - SD 5.0 - Group size .59"
28.4 grains - Max 2607 - Min 2591 - Avg 2597 - SD 6.3 - Group size .37"
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Here's the 8208 XBR results from today. Not what I expected.
Cloudy and 30degrees out, DA -640, 85% Humidity
Sierra 107TMK, 8208XBR powder, 2.26 COAL, new Hornady Brass, CCI 450 primers.
Chronograph used is a magnetospeed V3, groups were shot with bipod and rear bag, chrono not attached.
Rifle is a spare parts build with 18" Satern Barrel, Maxim bolt, Omega supressor, and adjustable gas block, nothing too fancy.
**THESE ARE MY LOADS FOR MY RIFLE AND MAY NOT BE SAFE FOR YOUR RIFLE SYSTEM. USE AT OWN RISK.**
All velocity strings were 5 shots.
Groups were 5 shots and measured center to center.
Had flattened primers and some ejector swipe at max charge.
I think I'm going to stick with ARComp. Had better results overall with less powder.
27.5 grains - Max 2450 - Min 2387 - Avg 2413 - SD 24.0 - Group size .91"
28.0 grains - Max 2479 - Min 2445 - Avg 2455 - SD 13.4 - Group size .62"
28.5 grains - Max 2531 - Min 2511 - Avg 2519 - SD 8.2 - Group size .54"
29.0 grains - Max 2589 - Min 2567 - Avg 2580 - SD 9.9 - Group size .81"
29.5 grains - Max 2644 - Min 2600 - Avg 2628 - SD 17.1 - Group size .76" (PRESSURE)
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I think your 18" barrel is key here.
If Sierra's reloading data shows 2750 fps as the fastest speed for the 107 TMK in a 24" barrel (loading PPV and TAC), and if one loses about 25 fps per barrel inch, then we'd expect an 18" to get 2600 fps with that bullet. Right?
So, if your 29.0 XBR load averages 2580 fps from your 18", you're in the ballpark.:: 6.5 GRENDEL Deer and Targets :: 6mmARC Targets and Varmints and Deer :: 22 ARC Varmints and Targets
:: I Drank the Water :: Revelation 21:6 ::
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Originally posted by BluntForceTrauma View PostI think your 18" barrel is key here.
If Sierra's reloading data shows 2750 fps as the fastest speed for the 107 TMK in a 24" barrel (loading PPV and TAC), and if one loses about 25 fps per barrel inch, then we'd expect an 18" to get 2600 fps with that bullet. Right?
So, if your 29.0 XBR load averages 2580 fps from your 18", you're in the ballpark.
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I used the data that Johnny used with the 129 Accubonds and had good luck. 1.5 MOA with his 26.7 load, I never used the highest he tried. It is minute of deer at 100yds so to speak. I use a 16in bbl and don't reach out. The BL-C2 loaded well and was about the same. I used data straight out of the book on that one.
#shareyourspare
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