The Danger of Using Wrong Ammunition
If you do not match the ammunition to the firearm, the cartridge could become lodged, explode, and cause serious injury to the user or a bystander. If the data stamp on the firearm does not match the data stamp on the ammunition, do not use the ammunition.
Smaller shotshells (such as 20-gauge shells), if mistakenly fed into a 12-gauge gun, will slip past the chamber and lodge in the barrel, causing serious personal injury or gun damage if a 12-gauge shell is loaded and fired. Some rifle and handgun ammunition also may fit into the wrong gun, creating a dangerous obstruction. The caliber or gauge stamped on the end of the shell must match that stamped on the gun barrel. Some barrels are not stamped. Be sure the right ammunition is used in your gun.