IMO nothing mentioned above with the possible exception of the 300WM, is a 1000 yds elk gun. 500, maybe 600, but the speed has come down too much to make the bullets work right past that. If you want a dedicated 1000 yd elk cartridge go with the 340 Wby. with the 225 TTSX or 250gr bullets. Sorry, but the 6.5s are not legitimate Elk rounds. The 270 with 160s or such, that will hold their speed, about minimum for Elk and an 06 better. And if going for long range, want the Barnes TTSX bullets as they long for weight, so fly better, and open up and penetrate. But nothing really going to "open up" out past 600 yds, very well. The 06 with a 180gr TTSX or similar will be the better round than the 270. Even Jack O'Connor used it on Elk.