It's only my 2nd 6mm. My first was/is the 6xc. It sure *feels* like the SLR has a much easier time propelling the 105s to 3150 than the XC does, despite the fact it takes more powder in the SLR. I guess the question becomes: What hurts a barrel more, 40gr H4350/
[email protected]/65,000psi or...