During World War II German snipers were issued with purpose-manufactured sniping ammunition, known as the 'effect-firing' s.S. round. The 'effect-firing' s.S. round featured an extra carefully measured propellant charge and seated an sS full-metal-jacketed boat-tail projectile of match-grade build quality, lacking usual features such as a cannelure, to further improve the already high G1 ballistic coefficient to approximately 0.595 (G1) or 0.300 (G7). The 'effect-firing' s.S. projectile had a form factor (G7 "i") of 0.869, which indicates good aerodynamic efficiency and external ballistic performance for the bullet diameter.