I have shot out several barrels over the years, and it takes a fair bit of shooting, even with a "hotshot" chambering as long as you keep it on the cool side and clean properly, as has been posted already. Even the 220 Swift, supposedly lethal on throats, gave me over 2500 very accurate rounds. A couple of 6mm Remingtons each delivered over 3000 before they would no longer hold moa. You get the idea. I would expect 2000+ very accurate rounds from a 300 Win Mag, even with "warm" loads. Eagleye