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The Taylor KO factor multiplies bullet mass (measured in grains) by muzzle velocity (measured in feet per second) by bullet diameter (measured in inches) and then divides the product by 7,000, converting the value from grains to pounds and giving a numerical value from 0 to ~150 for normal hunting cartridges.
Stopping power is the ability of a weapon – typically a ranged weapon such as a firearm – to cause a target (human or animal) to be incapacitated or immobilized. Stopping power contrasts with lethality in that it pertains only to a weapon's ability to make the target cease action, regardless of whether or not death ultimately occurs.
Caliber selection often can be reduced to balancing a handgun's physical features; weapon size, magazine or cylinder capacity, recoil, and ease of use. These features are all largely determined by the cartridge that the weapon fires. A list of many handgun calibers can be found at List of handgun cartridges.
This is a table of selected pistol/submachine gun and rifle/machine gun cartridges by common name. Data values are the highest found for the cartridge, and might not occur in the same load (e.g. the highest muzzle energy might not be in the same load as the highest muzzle velocity, since the bullet weights can differ between loads).
The .45 ACP is an effective combat pistol cartridge. It combines accuracy as well as stopping power for use against human targets, has relatively low muzzle blast and flash, and it produces moderate recoil in handguns (made worse in compact models or with hot loads). The .45 ACP is generally considered to have greater stopping power than the 9mm.
In 2013, a chart of popular calibers that was released by the website Luckygunner.com showed 9×19mm Parabellum as having 21.4% of the entire cartridge market, followed by the .223 Remington at 10.2% (with 5.56 mm included this is 15.7%). The next most popular caliber was .45 ACP. [19]
The Bren Ten (left) and Smith & Wesson Model 610 Classic (right), 1983.. When FFV Norma AB (now Norma Precision AB) designed the cartridge at the behest of Dornaus & Dixon Enterprises, Inc. for their Bren Ten pistol (a newly developed handgun with a design inspired by the CZ 75), the company decided to increase the power over Jeff Cooper's original concept.
The .380 ACP is compact and light, but has a shorter range and less stopping power than other modern pistol cartridges, depending on the load of the cartridge and manufacturer. [ 9 ] .380 ACP remains a popular self-defense cartridge for shooters who want a lightweight or smaller pistol with manageable recoil.