Ok first of thanks for checking this out. I have a remington long action that I want to build a 1400 yards plus rifle and I was wanting some suggestions I've been looking at the 280 rem but don't know to much about it maybe 300 wm I just don't know what round will do what and when they go subsonic. I'm trying to stay away from the cost of reloading the 338 Lapua and I would like to have a descent barrel life thanks guys.