50 BMG .510 Diameter 800 Grain Bullex-N Solid Moly Coated 20 Count by Lapua carries the 50 BMG .510 Diameter 800 Grain Bullex-N Solid Moly Coated 20 Count by Lapua. Lapua’s Bullex-N is a solid copper bullet for .50 caliber match grade reloading applications. The Bullex-N bullet offers superior accuracy for long range target shooting in this remarkable rifle caliber. Specifications and Features: Grain: 800 Ballistic Coeffiecient (G1): 0.980