Can anyone verify this statement in the article: "But in order to prevent the enemy using captured British ammunition, they designed the rim of the cartridge that it cannot be gripped and ejected by the extractor of the German gun." Or was this placed in the article so German agents would read it and past the information on to Germany where a directive would be sent out from Wehrmacht HQ telling the troops that British 9 mm ammunition is defective and cannot and will not be used in German weapons.
Over 30 years ago I fired several hundred rounds of WWII Sten gun ammo through a MP40 without incident. The headstamps were clearly marked with wartime dates and the asterisk.