Third,
Late to the party here. Measured my 11-48s and 12 gauge 878. The 410 and 28 both measure 1.225 wide by 7 7/8 " long. 20 gauge 1.325 wide by 8" long. 16 gauge 1.340 wide by 8" long. 12 gauge 878 is 1.345 wide by 8" long. Dale