Chas. Askins was writing about his heavy 30-inch barrel Parker Bros. 28-gauge chambered for 2 7/8 inch shells in his 1910 book The American Shotgun. Ole Chas. said he was handloading 2 1/8 drams and 3/4 ounce of shot!!
FWIW the May 1900 UMC catalog only shows 2 1/2 inch 28-gauge cases but the April 1901 UMC catalog includes the 2 7/8 inch case.
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