.227 Sig Fury Hybrid is the commercial version of the U. S. Army’s 6.8x51mm ammunition. These high-velocity cartridges out performs ammunition of the same class by delivering increased energy on target and decreased bullet drop. They feature a unique construction of a stainless steel base attached to the bass case via locking washer. Because steel has a far greater yield strength than brass, .227 Sig Fury Hybrid cartridges are capable of producing much more pressure for greater muzzle velocity and energy. Sig Sauer Hybrid Ammo .277 Sig Fury 150gr Elite Accubond Hunting 20/Box H277SFAB150-20