From time to time I'll get a cluster of ground squirrels in my yard.They burrow and dig which causes damaging erosion when the winter rains come.....especially on slopes. One day a cluster was lined up and I aimed my Ruger 10-22 Stainless target model at one and the bullet made it through the first one and hit the one behind it. Both were killed with ONE bullet. The shot was made at about 30 yards. It'll probably never happen again...but I've a memebership in the "two kills one shot club".