I had a dent in my duck gun. I made my own version on a dent remover, there is such a tool, and got it a lot better but there was a little left. I shot some patterns and it seemed to shoot as well as it ever had. So I just hunted with it. They say that using steel shot will peen your choke so I was thinking that over time maybe it would peen out the remainder of my dent. I never saw that it got any better, but we moved a year or two later and I haven't hunted ducks since.