03-06-2018, 10:22 PM
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"
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"

