Answer:
Match the information on the barrel to the information on the cartridge or shotshell.
Explanation: When using fire arms, matching your firearms to the right ammunition is essential to avoid using a wrong mix.
A wrong mix of an ammunition to a firearm that is not it's own can cause an explosion or the loss of life of the shooter. The lids of the firearm and ammunition should be carefully read to ensure that they match, before using them together.