bump up the caliber to .22-250 and no matter where you hit them they are deadgot my furthest kill ever with .22-250........396 yards........took three shots but he just kept coming back out.......i like to drive or walk through the fields and once you see them, the book it for the hole..........more than 50% of the time (if you are quick) they will stop right before going down the hole........many groundhogs have died this way by me.....i also wait them out sometimes too.......if you see them out and they run, just get into a good position where you can see the hole.....give it 20-30 mins and they will be back.........i wait out a lot of hogs too..........man now i can't wait for the spring!!!!