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.
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