The 10 gauge shotgun ruled the market until the adoption of smokeless powder. Though largely supplanted by its 12 gauge sibling, the mighty 10 gauge endures.
Remington Model 10 Shotgun: The Other Trench Fighter - Athlon Outdoors
Some guns used for hunting may still fall under firearms ban, Liberal MP says
Why did 10 gauge shotguns fall out of fashion? I hear about them in the context of the Wild West, but rarely see or hear anything about modern 10-gauge shotguns. - Quora
Rise and Fall of the 10 Gauge Shotgun
Overview of the Browning BSS Side-by-Side Shotgun - Project Upland
Mossberg Optic-Ready 940 Pro Tactical 12-Gauge Shotgun: Full - Guns and Ammo
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19th Century Shotguns: Rise of the Repeaters
Throwback Thursday: Shotgun Barrel Lengths, Explained - The Shooter's Log