I found my magnum rifles are a lot harder on the throat than my non magnums.So I learned I should shoot the magnums a whole lot less.Here is one of my 300 Win Mag throats
Just like I was thinking. Its well known since I was old enough to read, that mags are rough on bores, hence shorter bore life.
But whats a gun for? To look at or to shoot? They make more barrels and gunsmiths every day. Easy enough to re barrel one.