I have an older .338 Win. Mag that I have been working on a load for and have it hitting ok out to 500yds. About 12-14" with 3 shot group. As it is an older rifle, I was wondering if a new barrel would be in order? And if so, how difficult is it to change the barrel on a Savage? Also, I have put about 250 rounds through it since I have owned it, I have no idea how many before that, about how many rounds will it "handle"? I have been told any where from 1,000 to 10,000 and to "depends on how clean you keep it". Just curious. THANX!