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This is one area I have not touched on much. The only barrel I have shot out is a 5.56 and that one was due to too much ammo too fast I think.
Under normal use (when you are not shooting 5 shots a second), my impression is that what leads to short barrel life is throat errosion. Throat errosion, again just my impression, is related to the ammount of powder and pressure (naturally it is comlicated by the rate of fire)?
I am asking not telling. Is that too far off the mark?
Riposte
PS: I dont own a borescope but I have a .264 Win mag with about 10,000 rounds through it. It still shoots OK but I doubt the throat is very pretty.
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