|Place of origin||Sweden|
|Number built||Prototype only|
|Parent case||.22 WMR|
The 4.5mm MKR cartridge was a prototype Swedish rifle cartridge.
The 4.5mm MKR was originally developed by Interdynamic AB, a Swedish company, in the 1980s.
Due to concerns about stopping power and problems with using rimfire ammunition the MKR project was abandoned at the prototype stage and thus the 4.5mm mkr never saw service or any kind of widespread use.
- Bullet width: 4.5mm (.177 in)
- Bullet weight: 1.58 g (24.4 gr)
- Muzzle velocity: 1,000 m/s (3,270 ft/s)
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