I like to hunt em', but I always called them ground hogs. Like you, I've seen a decline in their numbers, but I still usually shoot five to ten of them a year. I've killed three so far this spring. My favorite groundhog gun is my Ruger 77/22 Hornet with a Remington 45 grain hollowpoint. It's quiet, so it doesn't cause a disturbance amongst the neighbors, and it anchors them solidly. I've used a .22 long rifle, it's just too light, they always get away unless hit in the head, a .22 Magnum, which is pretty good out to 50 yards or so, then you have to hit them in the head, .223, kills em' right there, no questions asked but loud, and a .357 magnum (same story as the .223.) Seems like I shot one one time with a .30-06 too, but the .22 hornet and .22 magnum are my main guns, and the .357 revolver every now and then.