What occurs if you load a 20-gauge shotshell into a 12-gauge shotgun?

Loading a 20-gauge shotshell into a 12-gauge shotgun can lead to a dangerous situation where the smaller shell slides down into the barrel and lodges there. This happens because the dimensions of the 20-gauge shell are smaller than those of a 12-gauge, allowing it to enter the chamber of the shotgun.

When a 20-gauge shell is fired, it can create a serious obstruction in the barrel. This can lead to barrel bulging, bursting, or other catastrophic failures if another round is fired afterward, as the pressure from the discharge will have nowhere to escape. Therefore, it's critical to avoid this scenario by always using the proper gauge for your firearm. Proper training emphasizes not only the handling of shells but also the importance of ensuring they are compatible with the shotgun being used to prevent accidents and injuries.