Sporting ammunition imports require an ATF Form 6 import permit, and the importer must hold the appropriate federal license. Shipments are subject to CBP examination, and certain propellant or explosive content thresholds may also trigger Department of Transportation hazardous materials regulations governing packaging, labeling, and carrier requirements.

Air gun pellets are specifically enumerated in subheading 930629 alongside parts of shotgun cartridges. They are classified there rather than in the general cartridges subheading (930630) because they are designed for spring, pneumatic, or gas-powered arms rather than firearms using explosive propellants. The distinction matters because the duty rates and regulatory treatment can differ between subheadings.