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ShepherdsDog ShepherdsDog:
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It's not gauge for a shotgun ?
gauge refers to the weight of a lead ball that will fit down the barrel of a shotgun. For example a 10 gauge shotgun will allow a ball weighing 1/10 of a pound. Calibre is the diameter of barrel and projectile, rather than weight of the shot. The .410 unlike other shotguns is rated in calibre and not gauge.
Aaah you're right... We say, 10, 12 gauge but .410 is the diameter thus the caliber. Like you say, it's not referred as others shotguns in gauge.
According to Wikipedia, a .410 is 67½ so maybe that's the reason

I used to shoot 10, 12, 16, 20 gauge and 410, a .410 is a good garden gun.
Back in England I had a .22 bolt action shotgun, .22 long rifle cartridge filled with dust shot. Good close range rat killer. No good for coons.