My stepfather has just passed and left me a model 15 with a python 357 barrel. I'm told it was done by Bill Davis, in the late '70's. My problem is when I put a .357 mag load in the cylinder the end of the round petrudes from the back end about a 1/16th of an inch. I thought a .357 load in a .38 cylinder should petrude through the front. I know a lot of .38 rounds have been fired from this pistol, and there is a carbon line on the inside of the cylinder about an 1/8th of an inch from the front of the cylinder. Could this be the reson why .357 loads wont fit in this pistol?

Thanks in advance- Steve.