The chambers of 203330 most likely left Meriden 2 5/8-inch intended for 2 3/4-inch shells. No one can tell you over the internet what ammunition may be safe in a given gun. A 2-frame Parker Bros. 12-gauge gun in sound condition should handle any SAAMI Spec lead loads. By serial number this is a 1923 gun, the year after our ammunition factories began producing progressive burning powder, high velocity, 1 1/4-ounce, 12-gauge loads. The gun has probably digested lots of them. Whether one wants to subject the 99 year old wood to the recoil of high velocity 1 1/4-ounce loads is another question.
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