Call a few of the larger gunsmiths and barrelmakers and you will find out the answer for yourself.I talked to a few before building my 300ultramags,and they were replacing 30-378 barrels with far fewer than 2000 rounds through them.Keep track of the shots fired inyour own rifle,then post some groups firedwith over 2000 rounds through the barrel.That is if you have not already replaced the barrel by then.