We are using a 338-300RUM and would like to take whitetail between 800 and 1500 yds. We are pushing the 300gr MK's at 2900fps and the 250 Lapua's at 3150fps which bullet would you use for this application.
Any bullet you pick will drop that poor deer in its tracks. I've got a .338 RUM and mine loves 250 grain Gamekings. I'll be checking to see how it likes 225 grain accubonds next. Speers are poor, and Hornady are so-so. Haven't tried Matchkings yet. I'm getting similar velocities using WC852 powder and CCI250 primers.