Changes the law regarding the sale of firearm ammunition

HB 261 requires all ammunition sellers in Missouri (except specific exemptions) to obtain a license from the Secretary of State by December 31, 2025. It exempts certain hunting clubs, nonprofit shooting organizations, target facilities, and individuals selling limited quantities (under 250 rounds yearly). Sellers must meet eligibility criteria (not being prohibited from firearm ownership), and licenses expire annually. Violations are punishable as class D misdemeanors, with each sale counted separately. The bill establishes a licensing process starting September 1, 2025, with the Secretary of State setting rules for implementation.