No, it's not too small for deer and bear.
The .45 Colt, from a handgun, when loaded with a 255 grain hard cast pushed to around 900 fps will shoot through a broadside deer like nothing. Pushed a little harder, it'll handle bears plenty well enough.
And the same load from a rifle will shoot faster yet, and that's not even a "hot" or "Ruger only" load. The limiting factor is trajectory. Beyond a hundred yards or so, the bullets drop fairly quickly. Used within it's capabilities though, it's a fine hunting cartridge.
Daryl
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