Yeah, I've never seen a .270 and a 150 Partition "fail" on an elk--or similar-sized African plains game. Haven't seen vast numbers of moose killed, but the "quickest deadest" was the medium-sized Shiras bull my wife killed in 1989, using Jack O'Connor's old load of 58.5 grains of the original mil-surp H4831 and a 150 Partition.
The bull was standing angling away at about 125 yards, and Eileen aimed for the far shoulder. At the shot there wasn't any of the typical moose reaction of "gee, that felt funny, I'll stand around for a while and see how I feel." Instead the bull took a step-and-a-half and folded up dead. We found the Partition in the far shoulder.
