Experimental cartridge dating from 1972 by IWK (Industrie Werke Karlsruhe). Based on a shortened 5.56 NATO case.

     Experimental cartridge dating from the early 1970's when the search was on to find an improved assault rifle. One school of thought was smaller diameter, lighter and faster bullets. This 3.5mm version was an intermediate design by FN in...

This was a continuation of the 3mm microballistic development at Frankford Arsenal during 1962 – 1963 and used the 222 Remington Magnum case necked to 3mm. bullet was a solid copper alloy with a 10 caliber ogive and case has the rippled shoulder. It is not clear if...