Ammunition round assembly with combustible cartridge case

An ammunition round assembly fireable through a barrel of a firing device of a known caliber, comprising:

• a cartridge body having a top end portion with a first connection member thereon, the cartridge body being made of a combustible material configured to be consumed in combustion upon firing the ammunition round assembly in the firing device;
• a projectile positioned adjacent to the top portion of the cartridge body having a caliber that substantially matches the caliber of the firing device;
• and
• an attachment sleeve having a second connection member releasably engaging the first connection member of the cartridge body, the attachment sleeve connected to a portion of the projectile spaced apart from the cartridge body, the attachment sleeve configured to resist longitudinal motion of the projectile relative to the cartridge body.

An armament system, comprising:

• a firing device having a firing chamber and a barrel with a first caliber;
• an ammunition round assembly sized to seat in the firing chamber for firing through the barrel, the ammunition round assembly comprising:
• a cartridge body having a top end portion with a first connection member thereon, the cartridge body being made of a combustible material configured to be consumed in combustion in the firing chamber upon firing the ammunition round assembly;
• a base connected to the cartridge body and being releasably engagable by the firing device;
• a propellant charge contained in the cartridge body and being configured to be consumed in combustion along with the cartridge body;
• a projectile positioned adjacent to the top end portion of the cartridge body and sized to be fired through the barrel, the projectile having a second caliber that substantially matches the first caliber;
• and
• an attachment sleeve connected to the projectile and the cartridge body, the attachment sleeve having a second connection member releasably engaging the first connection member of the cartridge body, the attachment sleeve configured to resist longitudinal motion of the projectile relative to the cartridge body until the ammunition round assembly is fired.

An armament system, comprising:

• a firing device having a firing chamber and a barrel with a first caliber;
• an ammunition round assembly sized to seat in the firing chamber for firing through the barrel, the ammunition round assembly comprising:
• a cartridge body having top and bottom end portions, the bottom end portion having a first retaining groove therein, the cartridge body being made of a combustible material configured to be consumed in combustion in the firing chamber upon firing the ammunition round assembly from the firing device;
• a base connected to the bottom end portion of the cartridge body, the base being sized to be engaged by the firing device and having a second retaining groove radially adjacent to the first retaining groove, the first and second retaining grooves defining a locking groove between the base and the cartridge body;
• a retention member positioned in the locking groove, the retention member engaging the cartridge body and the base in the first and second retaining grooves to hold the cartridge body and the base together until ammunition round assembly is fired from the firing device;
• a unitary projectile positioned adjacent to the top end portion of the cartridge body and being deliverable along a trajectory to a selected target, the projectile having a second caliber that substantially matches the first caliber;
• and
• a breakable attachment sleeve releasably engaging the projectile and the cartridge body.