A woman I work with and her husband have a problem with some groundhogs. Thes (supposedly 2 or 3 of them) have torn up the yard around a shed, eaten grapes, and done lawn damage. Thats not a big deal to them, thing is they have a beagle that wants to confront these rather larger groundhogs on their own terms under the shed, and I told them that would be bad for their dog, as did the vet. They said one groundhog appears bigger than their 10lb beagle by a decent bit. I am going this week to try and kill a few, thing is, they are located between a horse field full of horses and the other side 20 yards of woods near a golf course. I have a scope mounted .22 marlin and a non scoped one, plus 2 pump shotguns, 12 Gauge. I can get within 30 yards very easily, just wondering if the .22 would be enough to stop a larger groundhog, or would I have to go with a shotgun.