Slightly larger companion to the 2.7mm Kolibri, chambered in a marginally larger vest-pocket pistol. Both cartridges were marketed as 'last resort' self-defense rounds despite generating energy levels more comparable to high-powered air rifles.
Type: Pistol
Introduced: 1914, Austria
Parent case: None
Standardization: None
Bullet diameter: 0.12" (3 mm)
Case length: 0.32" (8.1 mm)
Overall length: 0.43" (10.9 mm)
Max pressure: 25,000 PSI
Rim type: Rimless
Primer: Centerfire
Typical twist rate: 1:10
Muzzle velocity: 600–650 fps
Muzzle energy: 3–4 ft-lbs
Effective range: 5 yd
Common bullet weights: 4 gr
Primary use: Self Defense
Production status: Discontinued
Also known as: 3mm Auto
History: Developed alongside the 2.7mm Kolibri by Franz Pfannl, the 3mm version offered trivially more power in a slightly larger pistol. Both are collector curiosities today; the distinction between the two calibers is primarily academic. Original specimens are extremely rare and command high collector prices.
Notable firearms: Kolibri 3mm Semi-Automatic Pistol
Similar cartridges: 2.7mm Kolibri, 4.25mm Liliput