I can't imagine a 300 Win Mag lasting to 5000 rounds, not with that short neck and all that powder. I think I maybe got 1500 rounds out of my 25-06 before the throat washed away.
I think my first CRMO 223 barrel off my Savage lasted 3000 or so shots. Actually, the last group it shot was a .415 but the throat was out too far to use the magazine any more. It's in the stash to be set back and put on something, someday.
