Doubletap Ammunition Defense 357 Sig 125 Gr Jacketed Hollow Point JH. This round virtually has no muzzle flash and is an excellent defensive load with excellent penetration. Specifications for Doubletap Ammunition 357S125BD Defense 357 Sig 125 Gr Jacketed Hollow Point (JH: Manufacturer: Doubletap Ammunition Caliber: .357 SIG Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 125 grain Cartridge Case Material: Brass Muzzle Velocity: 1450 ft/s Application: Self-Defense Primer Style: Centerfire