Buffalo Bore Ammunition Heavy Low Flash 357 Sig 125 Gr Jacketed Hollow Point 20 Per Box/ 12 Case. loads. These loads are full power 357 Sig not watered down stuff. The 357 Sig was designed to blast a 125-grain bullet at 1425 FPS out of a four inch carry gun barrel. These loads use flash suppressed powder for a huge tactical advantage. Specifications for Buffalo Bore Ammunition 25A/20 Heavy Low Flash 357 Sig 125 Gr Jacketed Hollow Po: Manufacturer: Buffalo Bore Ammunition Caliber: .357 SIG Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 125 grain Cartridge Case Material: Brass Muzzle Velocity: 1425 ft/s Application: Protection Primer Style: Centerfire