Run a 6" machinist scale in the breech end. If it catches you have a step in the chamber and I would then cut shells to the correct length. If not I wouldn't worry about a extra 1/8' of shell length. Many of the old SxS's had chambers a 1/8" shorter than the shell. They thought it would help sealing the fiber wads a little better. If you have the stuff, go for it. I had a Parker 10ga lifter with a step 2 5/8" . I shot 2 5/8" shells in it. Not sure if it was necessary, but I felt better doing it.
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Paul Harm
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