Originally Posted By: pyscodogI shot the BK's today with H4350 and a CCI primer. They shot the best of anything I have tried so far in the Sendero. Going to try some different primers and maybe a tad more powder to see if I can tighten the groups up a little. If that don't work, I'll start playing with seating depth.
I've had the best luck using Fed 210 or Win LR primers with this cartridge. The 2 best bullets for groundhog hunting for me are the 85 gr Nosler and the 90 gr BK. For powder I've been using RL19 at 57.0 gr for 3600 fps.
Also tried the 75 gr bullets, very accurate but they just ran out of gas long before the 85/90 gr. Wrote them off after one season.