A Parker Bros. 12-gauge with chambers that measure 2 5/8 inches is intended for 2 3/4 inch shells. Being from 1927, such a gun, in sound condition, should handle any SAAMI spec, lead, 2 3/4 inch 12-gauge shell. Whether 93 year old wood is up to that may be another question.
Since the introduction of progressive burning powder, high velocity, loads in 1922, the great bulk of these old guns have digested many boxcar loads of them. I'm sure my Grandfather's heavy 1890 vintage PH-Grade that my Father was using at King Lake in 1932, digested lots of them.
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