.25 Auto (6.35mm Browning) Handgun Cartridges

This cartridge was introduced in the United States along with the Browning-designed, Colt manufactured 'Vest Pocket' pistol. Also referred to as the 6.35mm Browning, this semi-rimmed centerfire cartridge has fairly high velocity for such a small size. However, the energy it delivers at any range is quite low. This, combined with the full metal jacketed bullet, adds up to a very poor stopping or killing power on anything. The .25 ACP is not powerful enough for hunting anything but pests, nor is it adequate for serious self defence. However, the .25 auto caliber pistols are popular because of their small size and low cost.

.25 Auto (6.35mm Browning)

**See below for further reference regarding the power rankings listed in the tables above:

MV-Muzzle Velocity
Muzzle velocity when fired from a typical handgun. Measured in feet-per-second.

ME-Muzzle Energy
Muzzle energy when fired from a typical handgun. Measured in foot-pounds.

PF-Power Factor
In shooting competition the Power Factor is used to determine the competitive division in which a particular handgun/cartridge can be used. A simple calculation of the bullet's mass times its muzzle velocity.
PF = bull. mass x muzzle vel.

TKO-Taylor Knock Out Formula
Developed by big-game hunter John Howard Taylor in the 1940's. Calculates the relative effectiveness of bullets for hunting game.
TKO = (bull. mass x muzzle vel. x bull. dia.)/7000