Guys, I have both of these calibers in Contender Carbine, and enjoy both, but in looking at stats, I really don't see a real difference in them. The only thing I see is that the 7mm bullet might travel better for long distance which I don't do. I shoot 120-150 gr bullets in both and max 100 yards. If there is a real difference I am missing please tell me. Am thinking about selling the 7-30 barrel just to reduce unneeded things. Wallacem in Ga