Just a caution, but reaming safely will be decided by the thickness of the barrels just past the present forcing cone. I have seen some barrels which just did not measure enough thickness to risk the pressure, and other who had plenty of "meat." If you are lucky, then it makes all the difference in the loads you can accommodate, but for peace of mind, have it measured. Of course, lower pressures always do the gun a favor. I would recommend a standard short forcing cone if you do lengthen the bores, as a long forcing cone in my experience will always lower the pattern or shot (or strike of a slug) 6 inches in every drilling I ever used one in. In one case I did it on purpose because the gun shot high. Glad there is no pitting--one less thing to worry about. Great find for the price! Keep the hinge greased and it may outlast you. Congratulations!