For the sake of making this simple, lets take into account we are talking about stock Rem 700 Sendero heavy 26" Barrels, off the shelf ammo, and normal cleaning routines.. I know a regular .300 win mag will get more life than a .300 RUM and .338 RUM will, but how much more? are we talking a couple hundred rounds, several hundred? 1,000? I keep hearing the .338 RUM will toast a barrel much quicker, but whats much quicker? I was 99% sure I wanted a .300winmag, but now Im considering the 2 bigger boys. Those are the 2 calibers I can readily find in Sendero models, thats why Im asking. other than the .300winmag being slightly cheaper to shoot, I also have to take recoil into account. I dont want a .338RUM if it kicks the hell out of me and the barrel life expectancy is a 1,000 less than the other 2. Whatever I chose, Ill be doing bench shooting often(not as often as with my .308), and also using it for bigger game such as elk and moose. Thanks in advance for answering.