I had the one with the 20" barrel in 9 twist. It loved those 68 and 69 gr HPBT with RE 15 and Varget. Somewhere in the 23 to 24 grain load. It would shoot clover leaf groups at 100 yards. Actually, it ate everything from 40's to 69's without complaint. I even used it in F Class with the 68's for 300 500 and 600 yard.
Tom