Out at our baseball field we had them damn pest diggin holes in the out field so we just took muskrat traps, conibears, and put them in the entrance of their holes and caught about 10 or so. Never even thought about that idea your talking about....I bet you had to be quiet and real still when you guys did it because they can feel any vibration in the ground and not come up. But it does sound like fun!
I mostly just go out with my .17 HMR and find them out alseep sunnin and shoot 'em!!