6CM is a cool cartridge, but my current 22CM load is 1,800 FPS out to 950 yards at 50 degrees and 5K elevation. That’s in a 20” hunting profile barrel not some monstrosity that sucks to carry and balance when shooting. It surpasses the “killing yardage” from my 20” 243 and my 18” 6CM.
Really no need for a 6mm other than the few states that have caliber minimum regs (that I’ve never once seen enforced or “checked” in 27 years of hunting across the west and Midwest). Or if you go with a super hot 6mm like a UM. Or ya know, if you want to shoot it, which is cool too