stubblejumper,
Unfortunately no formula can take into account proper cleaning and not allowing a barrel to overheat.
True so very true. Also no formula takes into account the shooters that just burn their barrels up by shooting max loads, or higher. I've got over 1,000 rounds thru my .257 and it still shoots around .75". I have a .300 Weatherby that I rebarreled a few years ago that was pushing 2,800 rounds before the accuracy went away. Like anything, the better you take care of it the longer it will last. Lawdog
