Probably intended for brass shells. Back in the day, brass shells were offered in a plethora of lengths. Both Winchester and Union Metallic Cartridge Co. offered their 12-gauge brass NPEs in 2 1/2 inch length, as well as 2 5/8, 2 3/4, 2 7/8, 3 and 3 1/4 inch lengths. My very heavy 2-frame 1889 vintage Quality GH, with a stamped weight of 58 has 2 3/4 inch chambers with the step at the mouth.
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