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Why is the .410 shotgun shell named differently than other shell sizes? It's the only one I've heard of that isn't a 'gauge.' - Quora

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410 bore, Gun Wiki

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St.Theresa Roman Catholic Church - Saint of the Day – Saturday 8th January 2022 Severinus of Noricum St. Severinus of Noricum Profile was born in 410 AD in either the Roman Province

Why is the .410 shotgun shell named differently than other shell sizes? It's the only one I've heard of that isn't a 'gauge.' - Quora

410 bore, Gun Wiki

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Are there any military 410 shotguns? - Quora