The cartridge of claim 1, wherein the rifle cartridge is a. 308 caliber cartridge containing from 6 to 9 grains of pistol propellant and a projectile weighing from 150 to 220 grains.ġ9. 223 caliber cartridge containing from 3.5 to 4.5 grains of pistol propellant and a projectile weighing from 50 to 60 grains.ġ8. The cartridge of claim 13, wherein the propellant is cannon propellant.ġ7. The cartridge of claim 13, wherein the projectile has a longer bearing surface than a comparable projectile designed for supersonic flight and use with the rifle cartridge casing.ġ6. The cartridge of claim 13, wherein the projectile is heavier than a comparable projectile designed for supersonic flight for use with the rifle cartridge casing.ġ5. The cartridge of claim 1, wherein the rifle is an automatic or semiautomatic rifle having a cycling firing mechanism, wherein the projectile travels as subsonic or reduced velocity when fired from the rifle, and wherein the cartridge produces sufficient pressure to cycle the firing mechanism.ġ4. The cartridge of claim 1, wherein the projectile, when fired from the rifle, travels at subsonic or reduced velocity that stabilizes and achieves Minute of Angle at 100 yards.ġ3. The cartridge of claim 1, wherein the projectile, when fired from the rifle, travels at subsonic or reduced velocity that stabilizes and follows a predictable trajectory at a range up to about 200-800 yards depending on caliber.ġ2. The cartridge of claim 1, wherein the projectile, when fired from the rifle, travels at subsonic or reduced velocity that stabilizes and follows a predictable trajectory.ġ1. The cartridge of claim 1, wherein the cartridge may be used with a rifle equipped with a sound suppressor.ġ0. The cartridge of claim 1, wherein the projectile, when fired from the rifle, travels at subsonic or reduced velocity that stabilizes and maintains sufficient energy to be lethal and penetrate modern body armor.ĩ. The cartridge of claim 6, wherein the cartridge casing is colored black.Ĩ. The cartridge of claim 1, wherein the cartridge casing is colored to identify the cartridge as a subsonic ammunition cartridge.ħ. The cartridge of claim 1, wherein the propellant is spherical powder.Ħ. The cartridge of claim 3, wherein the quantity of propellant is in the range from about 15 to 20%, by weight, of the propellant used in a standard supersonic rifle cartridge using the cartridge casing.ĥ. The cartridge of claim 1, wherein the propellant is a moderately fast burn rate pistol propellant.Ĥ.
The cartridge of claim 1, wherein the projectile is selected to have a center of mass that is approximately equal to the center of length.ģ. A subsonic or reduced velocity ammunition cartridge comprising: a standard rifle cartridge casing having a base end and an open end, sized to be used with a standard rifle having a standard rifle twist rate, said cartridge casing having an internal volume a primer inserted in the base end of the casing a quantity of propellant disposed within the casing, wherein the propellant is not a standard rifle propellant and a projectile sized to fit within the open end of the casing and which is stable at subsonic velocity and at the rifle twist rate.Ģ.
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