I am wanting to build myself a rifle that I can shoot at least 3000yds-two miles(3520yds). My two picks are the 408 Cheytac or the 50BMG. I have read articles that say the big 50 loses steam around 2900yds and I have read articles that say the 408 is the way to go if two miles is on the agenda. I know the 50 BMG has more energy but it lacks velocity. This rifle will be for steel targets only. I don`t want anyless caliber and these two are my picks, nothing else! I have been shooting extreme long distance for about 4 years and my furthest hit is 2449yds with a 338 Excaliber. Now I want BIGGER. Any help would be appreciated.