I have a couple of different barrels chambered in this cartridge. The 1-10 twist I shoot the 68gr custom match with RL-19 and get excellent results out to 300 then they open up. I also shoot the 80 grainers w/H-4831 in this barrel.
The 1-9 twist I shoot the 95 Berger or 105 A-Max with N-165 and get great performance well beyond the 500yrd mark.
Could not get the that 70 grain Bal-Tip to shoot real tight in either barrel as I had expected to.
I have been using this load for varmints in My Model 700 VS .243 that was reamed to AI. Groups under 1/2" if I do my part. This loads makes small critter blow up and bigger critters fall over in the tracks.