I built a 6.5X55 on a Ruger #3 frame, 24" 8 twist Pac Nor. Shoots! Bought 26" 6.5X55 Custom Shop TC Encore barrel for my Encore. Shoots!
Why do I need a 6.5CM?
Bought one. Kimber Hunter, 22" barrel, 8 twist. LOVE IT! 120 NBT @ 3000fps with 44.7 IMR 4451. Clover leafs. (3 leaf clover) The gun is more accurate than I am. My 80 yr ole bones do well to shoot 5 inside an inch.
Sounds like you and the rifle are doing danged WELL! Keep a shooting.