I want to tighten the groups on two of my rifles. I was wondering if anyone had ammo recommendations to start my experimentation with.

Kimber Montana .308

Browning A Bolt Gold Medallion 300 win mag (original-not the II)

the best groupings I have found for the Kimber are with Barnes triple shocks at 100 yds and core lokts for the Browning.

I know rifles can be very picky as to their favorite ammo but I have to start looking somewhere!

Any suggestions would be greatly appreciated-thanks