Started load development today in my 300 WSM. It's a built on a long action Pierce titanium action with a 26" Benchmark carbon barrel, 1 in 9" twist. ADG brass is on its second firing. Using H4350 and CCI BR2 primers, ran a pressure test with the 195 SBD2 seated 0.020 off the lands and checked velocity via LabRadar.
57.0 - 2688 fps
58.0 - 2723 fps
59.0 - 2755 fps
60.0 - 2787 fps
61.0 - 2827 fps
62.0 - 2891 fps, slight ejector, stiff bolt.
Shooting from 200 yards, 58, 59 and 60 grain loads were stacked on top of each other pretty tight, top right hand group is those 3 rounds:
View attachment 480069
Loaded up another 3 with a 59.0 grain charge and the pulled bullets that I didn't shoot for the pressure test:
View attachment 480070
Produced a group that's got an ES of 19 fps and a little better than 0.5 moa at 200 yards:
View attachment 480071
Nine shots into load development, it's looking pretty promising.
At my elevation of 900 feet, Strelock is showing stability at 1.51, which seems to be just a little over the recommended minimum. Anything to be concerned about?