RE: Bullet weight in 7mm magnum for elk?
160 gr bullets have been mostly used for my Moose and Elk hunting needs. Personally have used Failsafe, Nosler Partion and Nosler Accubond in 160 gr version in a .284, all have proved capable of this task. Others you can consider are the Barnes TSX, Speers Grand Slam and TBBC. All can be found in over the counter ammo (ie: Federal, Winchester, Nitrex).
IMHO the corelokts are best left for the smaller game.