I did the calculations on the weight of a 40 and 45 cal liner and the 45 won.
Because the weight being added is all forward of the breech face I want the biggest bore that fits safely into the 16 gauge barrel as is.
I don't want to make it any more front heavy than I absolutely need to
Because it has no butt plate I cant easily add weight to the butt to balance it up when the liner is in.
I could add a butt plate if I do need to hide some weight, but the existing checkered wood butt end is in mint condition and I would like to keep it as is if I can
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