Ah, the old Bounce Back Syndrome! I first discovered this with a Blackhawk, medium loads, and a cedar stump at five yards. Mesquite logs provide some bounce, also.
A buddy of mine was shooting his Python with some hot SWC loads at my hanging steel target; some 15 yards. Center-punched himself in the belly-button. Bruised himself into being a sho-nuff "outie"! (Good that he was wearing a winter shirt over a tee-shirt!)
, Art