I shoot a Marlin 917vs, and I LOVE this gun. I have a nikon Pro Staff 4x on top. I've killed woodchucks, a bunch of gray squirrels, and a ruffed grouse that i happened to catch on the ground. I wouldnt go after anything bigger than a big woodchuck or a varmit of similar size.
The first woodchuck I shot i couldnt find any holes, until i touched its head and the whole thing felt like jello. Very small entrance with no exit.