Why is it dangerous to carry 20 gauge shells when hunting with a 12 gauge shotgun?

Carrying 20 gauge shells while hunting with a 12 gauge shotgun is particularly dangerous because these smaller gauge shells can become lodged in the barrel of the shotgun. If a 20 gauge shell is accidentally loaded into a 12 gauge shotgun and fired, it may not create an adequate seal or can potentially cause a blockage. Firing the shotgun in this condition can lead to a catastrophic failure of the firearm, resulting in serious personal injury to the shooter and bystanders. This is why it is critically important to match the gauge of the ammunition with the gauge of the shotgun being used. Ensuring that only the correct gauge shells are carried and used is vital for safe hunting practices.