I was told that coning was the chamfering of the barrel next to the cylinder. It's supposed to help guide the bullet into the barrel of older revolvers that may be slightly out of alignment because of wear. I have an FIE revolver that has a rather large chamfer on the barrel next to the cylinder and it shoots pretty good. If it weren't for the fact that my Dad gave me the pistol I would most likely just sell the pistol, but I would like to try to get it in good working order. Thanks, Worm.