FA .454 Casull, 2-6X Bushnell Elite, 260 gr. Speer Mag. HP. Hit them high in the back at the wing butts. No meat damage. I've tried .357s,.44s, .223 T/C, .45 ACP. The only reliable guns have been .375 JDJ (270 gr. lead FP) and my .454. I've taken about 3 1/2 dozen with it with ZERO losses.