Sig Sauer FURY, Hybrid Case, 277 Fury, 150 Grain, Accubond Ballistic Tip, 20 Round Box H277SFAB150-20 FURY Hybrid Case Technology allows for increased muzzle velocity and greater energy than traditional brass cases. SIG FURY Hybrid Case Ammunition outperforms standard ammunition in similar calibers, with decreased bullet drop and increased energy on target. Developed for the U.S. Military's Next Generation Weapon Systems.