What's the Difference Between Gauge and Caliber?
This firearms training video hosted by Michael Martin, chief firearms instructor for the USCCA, clearly explains the difference between shotgun gauge and rifle caliber. It details how caliber is a direct measurement of bore diameter, while gauge is an indirect measurement based on lead ball weight, with the .410 shotgun being an exception. The video also provides a recommendation for the best gauge for home defense scenarios and encourages viewer engagement on their preferred calibers and gauges. It's brought to you by the United States Concealed Carry Association.










