The 2.7mm Kolibri (2.7×9mm) is an Austro-Hungarian small centerfire pistol cartridge.
History[]
The 2.7mm Kolibri was marketed alongside the Kolibri pistols. It was developed in 1914 by Franz Pfannl, an Austrian watchmaker, with financial support from George Grabner. The 2.7mm Kolibri round was not well accepted due to a variety of reasons; the bullet's small size made loading cartridges into the magazine difficult without the use of tweezers, the bullet was very underpowered, and very inaccurate among other reasons.
Design Details[]
One bullet weighs just 0.2 grams (0.007 ounces), and is headspaced on the mouth of the case. It is the smallest commercially available centerfire pistol cartridge. Due to its extremely weak stopping power, it was never really anything more than a novelty. The cartridge and the related pistol are considered collector's items.
Performance[]
The bullet, when fired, has a normal muzzle velocity of 200 meters per second (656.2 feet per second), which resulted in a rather pathetic muzzle energy of 4 joules (3 foot-pounds): for scale, this is roughly half of the UK legal limit for an air rifle to be considered a firearm.