my hunting foree started with 10 boxes of shot gun slugs fired through a pump shotgun that had a loose barrel ( the hole in the reciever was over sized by 2mm per the factory after we sent it back in) that wobbled like a drunk on a teeter totter, and a scope base that was installed wrong. Essentially every time you worked the pump action, the barrel and scope would rezero to non matching values. It was funny, get it zeroed in. work a new shell in, fire and see a hole 1.5 feet AWAY from the point of aim. repeat.
Those fiochi loads had my fingers tingling after 3 cylinders for some reason.