6mmBR load

[jwv2001]

I've been working on this load for a while now. It is Lapua brass, 75 gr. Sierra Varminter, 32 gr. Varget, CCI BR primer. Average Velocity 3171 fps. The rifle is a Cooper M22 MTV with a 26" barrel. The group is .103" 5 shots at 100 yds. The reason the group is not centered is because the rifle is sighted in for 65 gr. Vmax which shoots similar groups.
I tried this same load using 75 gr. Vmax and for all intents and purposes could not even hit the target with that load.
This one works.

 

[ReedG]

For what it might be worth to you, the only way I could make the 75-gr. Vmax shoot in my 6BR was to "hard jam" them .015" and .020" into the lands. With exact same powder charge, group size went from .800" range to .200" range.

Not sure the Cooper twist is, but my 1:14 really liked the 55-gr. Sierra BlitzKing.

The Cooper looks like a great shooter.