I've been playing with Staball match quite a bit now. I really like it so far. I've shot Berger 108 elite hunters, Sierra 107's, and Barnes 112's. I can get them all to 2900fps + out of 26" proof barrels. I did a small data post over on accurate shooter with the 107. I went up to 34.5gr. This was all in Lapua brass mind you. It doesn't give me the tack driving accuracy of Varget or other extruded powders, but its still pretty good. I'm sure I can fix a lot of it with seating depth. Most of my testing I was using seating depths from loads developed with extruded powders.Proof 26"
Peterson, virgin
CCI 450
Winchester StaBall Match 31.5gr
Hornady 105 @ 2.790" BTO
2743 fps, sd 6.6, es 17 - 5 shot group 87°F
Grouped just under .5 MOA.
This is a new barrel, only 40 rounds so far. I am hoping it speeds up to at least 2790.
I had some pressure signs so this powder may not be fast enough for use in Peterson brass . Is anyone else using Staball Match in the Dasher?
Today I shot 33.8gr under a Barnes 112. 1.797 cbto. Lapua brass. It went 2897fps 6.6 SD for 5 shots. 1\2" group.
I've been using it in .308 as well with great success.
Concerning your pressure signs, I recently fire formed 200 peices of Peterson Dasher and had the same issue at the beginning. I was getting ejector marks with 29.5 gr of Varget and a 105bthp @ 2750 ish FPS. I had a few rounds that didn't go off and I had to hit them twice to get them to fire. It was driving me crazy. Then I realized that my virgin brass was ~ .011 short on headspace. So I moved my seating depth out to jam the bullet .020 and it fixed my problems. I somehow measured this incorrectly when I originally measured my virgin cases. Check you headspace.