Just got back - appears it was an earlier chronograph problem. Here is the data from today - certainly not enough to draw conclusions, but interesting none the less. 35 deg F, 6-12 mph gusty wind, 5 shot groups, 110 yds. I believe the gun is 1" with stuff it likes, the shooter never has proven to be in the 1/2" class. All data is RL 17, Nosler brass, 3.27" OAL.
59.3 g
Fed GM
AVG 2910 fps
SD 16
Group 1.3"
59.0 g
Fed GM
AVG 2909
SD 6
Group 1.4"
59.0 g
CCI BR 2
AVG 2871
SD 31
Group 1.6"
59.0 g
Fed GM Mag
AVG 2900
SD 3
Group .9
Those Gold Medal Mag primers might have some promise!
