If it were me I'd stick to bonded. Jack O'Conner used 130's even on moose but I agree go a little heavier. The Remington 140gr corloc ultra bonded would work well also any 140 or 150 gr partition but those get spendy. If you wand good ammo that won't break the bank and will hold up well the 150gr fusion loads are perfect. If it were me I'd go either 150gr fusion or 140gr corlok ultras. I guarentee you if you hit a elk in the heart/lung area with a 270 it'll kill it dead. The 270 isn't too small for elk I'd just keep the shots at 300 yards or less and the gun will do it's part if you can do yours