The Mach 2 should be enough gun for a ground hog if you don't go over 70 or so yrds with it. I know I've shot a couple groundhogs with a .22lr at 50-70 yrds and it worked just fine. Lucky for us in PA we can hunt groundhog during the turkey season (but only with the weapon you are hunting turkey with.. shotgun or bow in the Spring) from dawn till noon.. then after noon you can hunt the groundhogs as usual.