I'm running 7.1 gn trailboss for the 151 hp, gives 1025 fps at 15deg C, remember that's for my dies.
I'm running a 1:8 twist.
Get a chrony, it saves guess work and heart ache. If you're in the BOP happy to lend you mine.
If you hunt deer, get some lehighs from dean maisey.
Good luck.
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