I also have my doubt's on SEVERAL THOUSAND rounds. But I also have my doubt's many are going to shoot that many out of a RUM. Bigcountry I wouldn't blame the gunsmith I have an Improved RUM known as a 300 Tomahawk and I see more throat erosion than I like to see at 500 rounds, maybe 550. I guess if your shooting a big gun like the 300 RUM you want the very best accuacy, after all why buy a gun capable of making shots out to a 1000 yards and it not be accurate?