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Hello all. New to the site and a 1903 Parker 12 gauge. While the chambers measure 2 5/8 to forcing cone obviously, if an 1/8 of can be trimmed of the ends theoretically very little overpressure should occur. Take a look at the following pics and give me your feedback good or bad.
I test fired in a 2 3/4 chamber and put in parkers 2 5/8 without any impediment.
Modifying loaded 2 3/4 shells to 2 5/8
Threaded Mode