Practice cartridge

1. Field of the Invention A cartridge assembly for military and police training meets the requirement of practicing vividly while causing no harm. The assembly mainly has a projectile, a sabot, a C-type ring, and a cartridge case, wherein the projectile is disposed in a recess of the sabot; the sabot is fitted tightly into the case and the C-type ring is disposed in a slot at the bottom of the sabot. Upon a primer being struck to ignite the powder, the expanding gas partially outbursts and bleeds through an orifice to propel the projectile while the other part of the energy is applied to eject the cartridge case. As the cartridge case is pulled back, the elasticity of the C-type ring results in engagement of the sabot and the cartridge case, so as to achieve the aim of the ballistic cycle of the ammunition.