So, I have an A-5 3" magnum with the full choke barrel. I inherited from my Grandma. It is in decent shape, but certainly not in collector condition so I figured I'd try to get some use out of it. I've been told not to shoot steel through it, but I was wondering if I can shoot Hevi-Shot through it for coyotes this winter? Or, do I just need to make sure I shoot lead only? Thanks!