Saw the aftermath of a 139 hornady from a 7 Rem Mag on a nice desert ram earlier this month. The ram was DRT at 178yards and the cape damage at the exit seemed minimal as we skinned it for a full body mount. I'd go with whatever was most accurate in the rifle if just for the confidence factor...
Sako264- rocky mt can weigh 350 , desert ram 150-175. i shot my rocky with 168 berger, 7mm. went about 3/4 the through. very accurate. ram went about 10 yards. my experience with the 7mm mag with a 139 horn btsp, 140 sierra btsp, or a 140 accubond on big mule deer all excellent. the speed of the 140 grain bullets at 0-500 yd make up for bc. if i was hunting rocky mtn ram i would use a tougher bullet like the 139-140 mentioned. the hard part is drawing the tag.
