We have a deer problem. Deer are killing our fruit trees by eating the bark. A few evenings ago I counted 14 deer in the yard. I live in Salt Lake City with neighbors within 200 feet so am limited to low power guns plus I really don't wish to injure Bambi. I am using a Daisy Powerline 901 which works for one animal but no effect on the others. The 901 is a pump single shot Thinking a semi auto would move more deer away. Department of Wildlife says "Not our problem". Any thoughts or suggestions?