I had a 22" bl'd .264 Win. M70A. The best it would do with the same 120 XLC I used in the .260 CLC was 3,350fps, but it took 25gr. MORE powder to do it. I remarried that one to .458 Alaskan, another hairbrained wildcat I dreamed up. He'll of a good ctg.but not much better than the .458 Winnie7.