I am guilty of dropping the rifle from my shoulder and just looking. I've never had to do other than that as most of my big game (moose bears and elk) have been one-shot drops with the .458 and with the 7x57 using 140 Noslers at 2,940fps and 175gr. RN's at 2,500fps. Those were deer. With the elk, one was one-shot drop, while the other needed several while running, shooting the M94 in .45 Colt. It stayed on my shoulder. The 7x57load with 140gr. deer ran, but not far and since I was shooting a Ruger #1, I had no opportunity for a second shot in the bush anyway.
The .69 cal. ML always drops them, whatever they are, but that one has to dismount to load regardless.