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Although not originally designed for handguns, several rifle and shotgun cartridges have also been chambered in a number of large handguns, primarily in revolvers like the Phelps Heritage revolver, Century Arms revolver, Thompson/Centre Contender break-open pistol, Magnum Research BFR, and the Pfeifer Zeliska revolvers. These include:
Firing a .22 Long Rifle round in a .17 HMR rifle; Firing a .357 Magnum round in a .38 Special revolver (the opposite is however is a safe and very common practice) Firing a 9×19 mm round in a .40 S&W pistol; Firing a .300 Blackout round in a .223 Remington rifle
Compared to the 6.8×43 mm Special Purpose Cartridge, another round made to have increased stopping power over the 5.56 NATO, the 300 Blackout has different capabilities. The 300 BLK was designed with a specific shorter-range focus to have equal or more energy than the 7.62 Soviet and work reliably with suppressors.
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).
300 AAC Blackout (7.62×35mm), also known as 300 BLK, is designed for the M4 carbine and STANAG magazine. Soviet 7.62×39mm, also known as 7.62 mm Soviet, M43, or occasionally .30 Short Combloc, is designed for the SKS and used in the AK-47, AKM, RPK and RPD light machine guns. 7.62×40mm Wilson Tactical.
The KAC PDW fires a 6×35 mm cartridge, which is over a centimeter shorter than the 5.56×45mm NATO round. The 6mm bullet is slightly wider, and the standard 6×35mm bullet slightly heavier, than the standard 5.56mm bullet (65 grains (4.2 g) versus 62 grains (4.0 g)).
In the open division, IPSC has a lower power factor requirement of 160 kgr·ft/s for major, while the other IPSC handgun divisions require a power factor of 170 kgr·ft/s for major. Open and revolver are also the only divisions that allows major scoring with a 9 mm bullet diameter (the other handgun divisions require a 10 mm bullet diameter).
Most handgun projectiles have significantly lower energy than centerfire rifles and shotguns. What they lack in power, they make up for in being small and lightweight, lending to concealability and practicality. Handgun power and the effectiveness of different cartridges are widely debated topics.