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To find the correct cartridge, look on the left side of the rifle barrel. (Note: Some firearms may have markings on the top or on the right side.) On newer firearms, you will find numbers stamped on the barrel. Make sure the numbers on the barrel match the numbers on the ammunition before you shoot!

Data stamps on gun barrels showing gauge and caliber designations

Older firearms and custom firearms might not be marked, or the barrel or chamber might have been changed. If you need more information or if you don't know the correct ammunition for your rifle, take it to a gunsmith.

Factory ammunition almost always has a number stamped on the base of the cartridge case. The numbers identify the cartridge.