XP,
I started testing using Rl-22 and got up to 57.0 gr with the 107 gr Sierra which produced 3600 fps out of my 30" Lilja 3 groove, 1-8 twist.
Groups were running in the sub 1.5" ctc range at 500 yards and often under 1" so I tested no more.
Only load modification I have made over the years was to reduce to 55.0 gr for a velocity right at 3500 fps just to save on the fine barrel a bit. Still is shooting 1/4 moa at 500 yards consistantly.
By the way, my reamer got here yesterday for the 6.5 WSM so I hope to get it together this weekend after I finish up some customers rifles and hopefully range test it next week after the bedding cures for three days.
Will let you know how it does.
Good SHooting!!
Kirby Allen(50)