Is anyone still running the lighter heavies; 75 A Max's ,77 & 80 SMK's ? At the time I had mine built I only had a 300 yd. range, and a $hit pot full of the mentioned bullets so I went with a 26" 8T. Just got some H 4350, RL-16 & some 4451.
I shot just under 100 of the Berger 77gr OTM that didn't shoot well in my AR. I just loaded them over 28gr of 4166 for barrel break in. Shot really good out to 416 yards where I have a 12" plate for barricade practice. Not enough velocity gain to shoot the 75gr ELDM over the 88 at distance. I am really liking Rl16 with the 88gr ELDM. It should work fine with the lighter bullets too. Very temp stable in my 6.5 Creedmoor.
My barrel, 26" 7tw Bartlein sped up again at almost 400 rounds. I was getting 2958 with 30.2 of RL16 and am now up to 3030 fps with the same charge.
I have 200 of the 90gr A-Tips that I need to try in place of the 88s.