A few years ago I remember reading several articles about 9mm fired from revolvers. One was, I think, by Wiley Clapp. He published results that indicated 9mm revolvers benefited more from the added length of cylinder and barrel (compared to a chamber included barrel on a semi auto) than they were handicapped by the cylinder gap. Most of his published velocities showed 2-2 1/4 inch barrels getting velocities comparable to 3 1/2 inch semis and 3 inch revolvers running with 4-4 1/2 inch barrel autoloaders. I wish I had that chart to show here. Ammo capacity will never be comparable, lol.