The CCI shot shells for the 9mm are shaped just like a regular round so I would assume they cycle the same. When I am in snake country out here in AZ I switch back and forth in a mag. The shot shell with a JHP in the event of needing to protect against something other then a snake.
I heard a while ago they are not good for the rifling of the barrel. I doubt if they would do anything to the barrel of my XD. That was probably some guy talking out his ........
What do you guys think?