Here in oklahoma, it's pretty much what was said above, minimum barrel length, and minimum power rating for big game.
small game is basically .22's
but for a "backup" pistol during deer season for example, to give a "coup de grace" i think it can be almost anything.
I never worried about it much, since i always carry either my .357 or 10mm both of which are capable of ebing used by themselves.
Usually the .357, with 5 ratshots in it, if i need it for a coupdegrace, i have plenty of time to reload it.
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