a .458 Win mag would not kill you if not hit in the right spot! this says nothing about buckshot effectiveness or even bird shot for that matter. I think you hit a guy COM with a load of 1.5oz 4 shot and you would have a body to dispose of provided it was close range.
Colt King Cobra .357 Colt Anaconda .44mag
Springfield Armory .45 Double stack Loaded
XD40 service XD45 Taurus 617 .357mag
Smith M&P 40