The 15×106 cartridge was developed in mid-1930s by Skoda factory in Czechoslovakia, for the proposed new heavy machine gun manufactured by ZB factory in Brno. Before the start of Ww2 this heavy machine gun was adopted in UK for tank armament as 15mm Besa machine gun, and guns and ammunition in this caliber were manufactured in UK under license throughout first half of the WW2. Before WW2 Czech-made machine guns in this caliber were also exported in limited numbers to Yugoslavia and Iran. Apparently, no guns in this caliber were manufactured after WW2 and today this cartridge is completely obsolete.
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