Missouri Revised Statutes Title XXXVIII. Crimes and Punishment; Peace Officers and Public Defenders § 571.150. Use or possession of a metal-penetrating bullet during the commission of a crime--definition--penalty

1. As used in this section, the term “metal-penetrating bullet” means handgun bullet or projectile of 9 mm, .25, .32, .38, .357, .41, .44, or .451 or other caliber which is comprised of a hardened core equal to the minimum of the maximum attainable hardness by solid red metal alloy which purposely reduces the normal expansion or mushrooming of the bullet's or projectile's shape upon impact. Metal-penetrating bullet does not include any bullet or projectile composed of copper or brass jacket with lead or lead alloy cores or any bullet or projectile composed of lead or lead alloys.

2. Any person who uses or possesses a metal-penetrating bullet during the commission of a crime is guilty of a class B felony.