The first shot at game I had with the 17 HMR, was at A ground hog living under an old out building I had. I had been after it for 3 years. One afternoon in the fall, my wife calls me to the front door. Our driveway was a "U" shape, and at the road end of the far side was THE groundhog standing there with an apple in both hands, eating and watching traffic go by! I grabbed the 17 HMR and shot her in the shoulder at 55 yards. She must have had a nervous system twitch caused by the hydrostatic shock, she jumped straight up feet over head so the feet were about 5' in the air and was very dead when she hit the ground.
The next spring I had a shot at one of her older offspring, but he was on all fours sitting on my truck's front bumper. I opened the front door and basically dove to a kneeling position, he jumped off of the bumper and started running under the out building, but stopped and looked over his shoulder to see if I was coming at him. I got the shot off at that point square into his butt. He was froze right there for about 2 minutes with his tail spinning like a propeller! That was about 35 or 40 yards. I sold that gun shortly thereafter, and went back to 22 Hornet for around the house.
I bought a Savage in 17 Mock IV, but got rid of it quickly! I shot a groundhog at 10 yards in the shoulder and it ran 20 feet into the hole! No wonder that cartridge is discounted! It was very good on squirrels and chipmunks, but my problem was groundhogs and raccoons!
Ivan