If you are going to use it as a hunting gun, I'd go 6" for accuracy and additional energy.
If its a hunting backup gun I'd go 4" or 6" depending on which one you like best.
Personally, my back up, hunting, range gun is a 6" S&W 686. You just can't go wrong with a 6" revolver and the Ruger GP is a damn fine one at that.
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