410 bore - Wikipedia

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

I Have A Iver Johnson 410 Bore-full Choke Barrel/lug Forged In One. Behind

What caliber is a 410 shotgun shell? - Quora

410 pistol ( tc encore) legal?, Page 2

16-inch/45-caliber Mark 6 gun - Wikipedia

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Gauge (firearms) - Wikipedia

Caliber - Wikiwand

Axe .410 Henry Repeating Arms

Rossi Announces the New Single Shot Break-Action Rossi Polymer Survival Rifle in .410/.45LC - The Truth About Guns

Caliber - Wikipedia, PDF, Caliber

Сайга .410 К - Saiga-12 – Wikipédia, a enciclopédia livre

Axe .410 Henry Repeating Arms