I don't have a 6.5SLR to use as a comparison, but I do have a 6mm SLR. Between a 6mm Creedmoor, 6x47, 6xc, 6SLR and 243, there is no appreciable accuracy difference. I've seen them all shoot 1 hole at 100, and shoot sub 1/2 moa group at 1000 yards. Honestly, I can't say I'd really recommend...