I've likely told this before, but my first gun after the obligatory (for southern boys) singleshot .410 was a 20ga model 31 Remington pump that belonged to my mother. She'd fallen in a middle GA gully while bird hunting and bent the barrel laterally. I learned to shoot by using no lead at all in one direction and doubling the lead in the other.
I showed it to a local gun trader who led me out to his front yard where there was a forked tree. He took the barrel off and put it between the forks and bent it back straight by eye. I never could get used to that gun after that...Geo
