Doubletap Ammunition Controlled Expansion .357 SIG 115grain Jacketed Hollow Point Brass Cased Pistol Ammo 20 Rounds. 357 Sig DoubleTap has developed the fastest loading in this caliber BAR NONE Recently there have been no options for the serious .357 Sig shooter other than 125gr. DoubleTap also provides a loading that combines speed power match-grade accuracy and a flash suppressed powder for virtually no muzzle flash. Specifications for Doubletap Ammunition Controlled Expansion .357 SIG 115grain Jacketed Hollow Point (JHP) Brass Cased Pistol Ammunition: Manufacturer: Doubletap Ammunition Caliber: .357 SIG Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 115 grain Cartridge Case Material: Brass Muzzle Velocity: 1612 ft/s Muzzle Energy: 663 ft-lbs Application: Personal Defense Package Type: Box Primer Style: Centerfire Lead Free: No Package Contents: Doubletap Ammunition Controlled Expansion 357 Sig 115 Grain Controlled Expansion JHP Pistol Ammunition Doubletap Ammunition 357SIG115CE: Controlled Expansion 357 Sig 115 Grain Controlled Expansion JHP Brass Cased Pistol Ammo 20 Rounds