Abstract: A projectile for small munitions is provided having a bullet with an integral jacket runner formed from a resilient, shape-retaining material. The projectile comprises a bullet having a tapered front section, a cylindrical middle section and a tapered end section. The middle section includes a recessed retaining portion over which the resilient jacket runner is securely positioned or formed. The maximum diameter of the bullet is less than the primary bore diameter of the firearm barrel, and the outer diameter of the jacket runner when positioned around the bullet, is slightly greater than the primary bore diameter, whereby rifling in the barrel scores the jacket runner and not the bullet, and imparts spin to the jacket runner during firing and hence to the bullet which is integral therewith, achieving enhanced gas checking efficiency, accuracy and velocity. The integral jacket runner remains on the bullet after firing and downrange to its ultimate destination.