Fleming I agree on the 264 Win Mag I have been shooting my Remington model 721 since 1963 and finally replaced the barrel last summer. The original barrel had all bullets from 85gr HP to 165gr round nose max loads to 7grs under max. The key is to not over heat the barrel. My new Shilen 30 inch heavy barrel does not heat up to what the original barrel did and I am sure this new barrel will out live me.