Nov 15, 2025 · Over the decades, Gun Tests Magazine has reviewed dozens of self- defense shotguns chambered in 12 gauge, 20 gauge , or other bores. Some have been configured with extended magazines and some with standard capacities, but all have been capable of stopping an assault on your home or person with plenty of power. Nov 15, 2025 · Over the decades, Gun Tests Magazine has reviewed dozens of self- defense shotguns chambered in 12 gauge, 20 gauge , or other bores. Some have been configured with extended magazines and some with standard capacities, but all have been capable of stopping an assault on your home or person with plenty of power. The only difference between 12 gauge and 20 gauge is the size of their bores. A 12 gauge shotgun has a bore diameter of .729”. A 20 gauge shotgun has a bore diameter of only .615”. This is important to understand because it directly determines the gauge of the shotgun . Handguns and rifles are classified by the size of their bore. A .45” handgun bor... The only difference between 12 gauge and 20 gauge is the size of their bores. A 12 gauge shotgun has a bore diameter of .729”. A 20 gauge shotgun has a bore diameter of only .615”. This is important to understand because it directly determines the gauge of the shotgun . Handguns and rifles are classified by the size of their bore.
