Pesting in the strawberry isle

Its that time of year again. My strawberry isle is producing strawberries and the thirteen lined ground squirrels have moved in again. Last year i used my stock bullboss .22 at 35 yards. This year its been tuned by bwalton and shoots the 25.39 grain redesigned monster 840 fps for 20 regulated shots. 
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So i set up at 55 yards for a better view. All i could see was his head above the strawberry plants.
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