4.5 mm mkr
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The 4.5 mm mkr was developed by Interdynamics AB, a Swedish company, in the 80s. It was essentialy a .22 WMR necked down to a 4.5 mm bullet, designed to be used in the MKR rifle.
Due to concerns about stopping power and problems with using rimfire ammunition the MKR project was abandoned at the prototype stage and thus the 4.5 mm mkr never saw service or any kind of widespread use.
[edit] Specifications
Bullet width: 4.5 mm (.177") Bullet weight: 1.58 g (24.4 gr) Muzzle velocity: 1,000 m/s (3,270 fps)
