I didn't say use doesn't wear out barrels. I stated that being a bolt action, it's impossible to prematurely wear out a barrel by shooting it. In other words, you will never achieve a high enough cyclic rate in a bolt action to experience wear faster than what can be expected on average. Shooting 1000 rounds in an hour will cause the same wear as shooting 1000 rounds in a year. Although, achieving such a high cyclic rate could only be done with a support team loading magazines and the shooter having no regard for accuracy. Neither of which are very practical scenarios.