Thanks for all the responses, out of the calibers that's been suggested I feel like the .300 WM or one of the 7's pushing a heavy bullet would give me close to the barrel life I'm looking for as well as the distance. I like the idea of the 6.5's but feel like they might not be quite as versitile. I've been offered a spot on a moose hunt the last couple years so this rifle might see a couple larger critters than deer. I know these and even the 6.5 calibers are more than capable. Also I know that I'm asking a lot of of ONE caliber/rifle. I would just be shooting extreme distance for fun once in a while, but want to be able to actually do it, not just get lucky. Kinda like buying a 1 ton truck as a daily driver , but buying it because I pull a camper 2 times a year. So I agree with those who said I'm asking a lot for one rifle. If I were wanting to do a BUNCH of extreme range , I'd step up to a more suitable setup, and it would be dedicated to such. Now with all that said, what are some opinions of optimal barrel length and contour for these calibers and why? I love learning and hearing everyones opinion and reasons why. I don't think I want a super long barrel 26"+ but if it would give me a reasonable amount of more performance I would go for it. I have a 28" barreled .308 and its a bit unwieldy. Again thanks for all the responses!