Why is it important to keep shotshells separated by size?

Keeping shotshells separated by size is crucial for safety reasons. A smaller gauge shotshell can inadvertently fit into the chamber of a larger gauge shotgun, which can lead to catastrophic failures when the firearm is fired. This mismatch could cause the smaller shell to be improperly seated, possibly leading to a burst barrel or other dangerous malfunctions. Such incidents can result in serious injury to the shooter or bystanders, emphasizing the necessity of organizing ammunition by gauge. While other options mention practical benefits like storage space, inventory control, or shooting technique, the primary concern when it comes to shotshells should always be safety and the prevention of potentially life-threatening accidents.