03-11-2018, 09:21 PM
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)
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)

