This information is derived from a combination of sources: manufacturer's specifications,
measuruments performed by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI)
and approximation formulas devloped by Genitron.com.
Rankings shown here are based on a 8.5-inch pistol barrel. Rankings for guns of this caliber in our database will vary based on their actual barrel types and lengths.
In shooting competition the Power Factor is used to determine the competitive division in which a particular handgun/cartridge
can be used. It is a simple calculation of the bullet's mass times its muzzle velocity.
PF = bull. mass x muzzel vel.
TKO-Taylor Knock Out Formula
Developed by big-game hunter John Howard Taylor in the 1940's, this formula calculates the relative effectiveness of bullets for hunting game.
TKO = (bull. mass x muzzle vel. x bull. dia.)/7000
This cartridge is based on a .22 Magnum (WMR) rimfire case that is necked down to seat a 17 grain, .17 caliber Hornady V-Max bullet. As done with the .17 Mach 2, the .17 HMR is sized such that manufacturers can easily re-tool .22 WMR gun designs to the new .17 HMR cartridge. This is a supersonic varmint round that travels over twice the speed of sound with near flat trajectory to 100 yards. The larger cartridge and load gives the .17 HMR more than 1-1/2 times the energy at 100 yards than the smaller .17 Mach 2.