Amen to everything Mike said. You need to decide what you want the gun for. Mine is a hunting gun. It throws a lot of shot and the ball is large . It's dropped everything I've hunted with one shot. If I was mainly shooting targets with a round ball, I'd go with a 28, or maybe a 20 One of the reasons the 20 is so popular is that it fits that middle ground so well. But it's not the best for fowling. It will do, but the 10 is better.......a lot better. If you switch barrels on the same gun, then one will be heavier than it needs to be , since the profiles are the same.