Small-arm projectile has pointed rear and pointed nose - with longitudinal bore whose insert causes spinning

摘要

In addn. to the nose (12) pointed in standard manner, a fire-arm projectile has a pointed rear end (14). The entire rear end of the projectile may be initially held within a sheath (20) with flat rear surface and which drops off after firing to expose the pointed end. Reduced pressure behind the projectile is avoided, and spin imposed by a longitudinal bore (16) extending from end to end; the bore contain internal rifling (18), deepening towards the projectile rear, or an equivalently operating set of inclined projections (22). ADVANTAGE - Reduced air resistance improves range and penetration.