I have one 7mmSTW, (2) 280AI, (12) 7mmRM, and (3) 7x57mm.
Of 37 big game animals I have killed, 17 were with 7mm bullets.
I prefer 140 gr Nosler Ballistic tip or Accubond, but if I were forced, I would accept Hornady 139 gr SST
Of all the rifles I have shot, I think the 7mmRemMag is the best tradeoff in range, recoil, rifle weight, and accuracy.... but I keep buying other reamers and dies, just for variation.