I'm no expert, but I've been told by the builder that barrel life is subject to the loads used and barrel quality. The builder I'm working with uses Krieger Barrels exclusively, and has had exceptional luck. If kept between 2900-3000 fps, barrel life should be around 2000 rds, maybe even slightly better. This is assuming you're not heating up the barrel with several consecutive shots. I'm only shooting for my own entertainment, so excessive barrel heat is not something I'm overly concerned with.

Barrel life is something that I'm debating with. All this being said, previously I owned & shot the .300wm and had alot of fun. I have had the pleasure of shooting (not owning) the .338 LM which is an incredible (and proven) long-range round, but it was wicked..... good & bad!