D54 vs groundhog

Out the kitchen window after supper. .22 JBS 15.89
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One shot in the head. He simply rolled over, hind legs gave 1 kick and that was it. He is the fifth one I have killed with the 54. I will not shoot over 50 yards and at 50 yds conditions must be very calm, as it was last evening. Two I shot a bit low in the neck. Both ran about 10 feet and were dead. They have all been 1 shot kills.
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