Did a charge weight test today with Varget, Alpha Brass, CCI 450, 107gr SMK.
Nothing to impressive because I sucked. Groups could be tighter but I shot poorly and allergies were kicking my butt.
I'm going with 31.7gr and testing seating depth next. These were all at .020" off jam.
Charge | Avg | SD | ES | |
31.5 | 2875 | 8.6 | 23 | |
31.6 | 2882 | 6 | 13 | |
31.7 | 2888 | 3.6 | 11 | |
31.8 | 2901 | 6.3 | 16 | |
31.9 | 2904 | 3.8 | 9 | |
32 | 2916 | 6.8 | 18 | |
32.1 | 2923 | 7 | 19 | |
32.2 | 2927 | 13.5 | 27 | 3 shot |
32.3 | 2944 | 5.4 | 12 | |
32.4 | 2944 | 3.7 | 9 | |
31.5 gr wasn't terrible; the first shot was my first shot after screwing on the barrel so I'm not sure if that is due to the AI barrel settling in after being torqued down so I'm ignorning that one. shot 2 was dead centered. Still .75" vertical stringing is on me since at 100 yard the 23 ES wouldn't do that.
31.6 gr was my best group. Although .45" isn't anything great.
31.7" more vertical stringing. With an SD of 3.6 and 2,888 FPS I'm going to try to work with this more. I know I can do better and should be able to tighten this up.
31.8gr, I'm cheating and ignoring a flyer. Maybe I'll revisit 31.8gr and 31.9gr later at some point to retest.
And then everything else above 31.9gr grouped poorly. It looks like I was getting to a high node around 32.4gr and I wasn't seeing pressure signs but that's higher than I'm looking to push it, I'm happy with medium velocities around 2,900 FPS.