Unless perhaps you're packing a big revolver (.44 Mag, heavy .45 Colt and up), most handguns will not be your primary hunting tool, 10mm included and the OP stated that the pistol would accompany his rifle. Deer aren't exactly hard to kill, and service calibers will get the job done up close, which is more an issue of shot placement and not power. We all know a .22 will kill deer, so it's obvious a 9mm or anything bigger will too, heck there's a video of a girl killing a 900+lb hog with a .40.
"There is a principle which is a bar against all information, which is a proof against all argument, and which cannot fail to keep a man in everlasting ignorance – that principle is condemnation before investigation."
Last edited by SDGlock23; 10-07-2012 at 19:56..