Ammunition and magazine laws in Missouri

1.  A person commits an offense if such person knowingly possesses, manufactures, transports, repairs, or sells:
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(4)  A bullet or projectile which explodes or detonates upon impact because of an independent explosive charge after having been shot from a firearm;
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3.  An offense pursuant to subdivision (1), (2), (3) or (6) of subsection 1 of this section is a class D felony; a crime pursuant to subdivision (4) or (5) of subsection 1 of this section is a class A misdemeanor.

(x)(1) It shall be unlawful for a person to sell, deliver, or otherwise transfer to a person who the transferor knows or has reasonable cause to believe is a juvenile—
(A) a handgun; or
(B) ammunition that is suitable for use only in a handgun.
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(5) For purposes of this subsection, the term "juvenile" means a person who is less than 18 years of age.

Small Arms Ammunition: Ammunition is classified as a Division 1.1, 1.2, 1.3, or 1.4 explosive, depending on the degree of hazard. Ammunition that is regulated as a Class 1 explosive and designed to be fired from a pistol, revolver, rifle, or shotgun, as well as associated primers and blank cartridges (including those designed for tools) and propellant powder for use in any firearm, is prohibited from mailing.
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Shotgun Hulls, Empty Casings, Nonmetallic Shotgun Hulls, or Casings Without Primers: These articles are not classified as explosives or hazardous materials under 49 CFR and, therefore, are mailable, subject to the applicable mailing rules (refer to 224).