It appears 7828 has been giving us consistent .600 moa groups so we decided to do an OCW test with that. The extreme spreads have also been pretty decent We started at 43 grains and went to 44.2 grains
43 grains 43 es .580 moa 43.3 9 es .624 moa 43.6 4 es .785 moa a primer failed only two shots 43.9 53 es 1.3 moa 44.2 67 es .343 moa average speed 3000 fps
So 7828 had high exteme spreads with 4 groups under an moa and a decent ES at 43.3 One thing to note is all those powder charges were printing with almost the same point of impact.
We also tried some 210 primers with H4831sc 4 shots at 42.5 gr with a 15 es but the group was .94 moa
We also tried some 200 cci with H4831 sc 4 shots at 42.5 gr with a 28 es and a group of 1.2 moa
The reg 210's and CCI both beat the 210 match primers substantially but the groups opened up quite a bit
My buddy recommended we try imr 4064 with cci primers. The 4 shot group was bad but the ES was 3027,3024, 3026, 3000 and we thought that was pretty impressive so why not try an OCW test
