Here's what you need to know about shotgun gauges, to include the differences between 10 gauge vs 12 gauge vs 20 gauge and other popular bore sizes.
12 Gauge vs. 20 Gauge: Understanding Shotgun Gauges
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Shotgun Shells Explained - NSSF Let's Go Shooting
Shotgun Shells Explained - NSSF Let's Go Shooting
The often misunderstood 28-gauge - Sporting Shooters' Association of Australia (SSAA)
Understanding Shotgun Shells
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Why is a 12-gauge shotgun bigger than a 20-gauge? In other words, why is the gauge measurement used for shotguns in the first place? - Quora
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Shotgun Showdown: 12 Gauge vs. 20 Gauge vs. 28 Gauge
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12 Gauge vs 20 Gauge