The amount of cartridges in a magazine varies greatly, although it is typically between five (5) and thirty (30). (30). However, 50 or more are frequently accessible. There are semiautomatic rifles that can hold as many as 100 rounds of ammunition. There are currently no restrictions on the number of rounds a person can carry at one time. All that is required by law is that you be able to show proof of compliance - which may include showing your license, registering your weapon with the local sheriff's office, etc.- for each round of ammunition you possess. For example, if you have a gun store license then you must comply with the law requiring you to run a background check on anyone who purchases more than seven (7) rounds of ammunition at one time. If you do not have such a license then you do not have to worry about running out of ammo because there is nothing to stop you from buying multiple boxes at once. Some people keep track of how many rounds they use up on their own property and then buy additional boxes from time to time. This is usually done when they know they will need more than what's in their storage unit or rifle case for an extended period of time.