Buffalo Bore Ammunition Standard Pressure Heavy 45 Colt LC 255 Gr Gas Ch. Gas checked soft cast bullet at around 1000 fps or a 200gr. Jacketed Hollow Point at around 1100fps. they wanted loads that were substantially more powerful than today's weenie loads but that could be fired in ANY 45 Colt firearm. Both of these 45 Colt loads are designed to be a heavy loading yet be within standard (SAAMI) pressure. As such both of these 45 Colt loads are safe and recommended to be used IN ANY post-war 45 Colt that is in normal working condition. Specifications for Buffalo Bore Ammunition 3E/20 Standard Pressure Heavy 45 Colt (LC) 255 Gr Gas Ch: Manufacturer: Buffalo Bore Ammunition Caliber: .45 Colt Number of Rounds: 20 Bullet Type: Gas Checked Soft Cast Bullet Weight: 255 grain Cartridge Case Material: Brass Muzzle Velocity: 1000 ft/s Application: Protection Primer Style: Centerfire