7.9 x 57 & Cartridge, SA, Tracer, 7.92mm, Mk 3Z & 7.92mm BESA
rimless, bottle necked case with gilding metal clad steel jacketed spitzer bullet. The primer annulus has a red lacquer wash, indicating a tracer load. Loaded with a nitrocellulose powder.
When Britain adopted the Czech ZB 53 tank machine gun design as the BESA, the proximity of war resulted in the retention of its 7.9 x 57mm cartridge, the German service calibre, which had also been adopted by several other nations. The G Mark 3Z tracer was approved for land service in April 1945, and was a dark ignition design, dark to 150 yards and bright to at least 1,100 yards. It had been requested because gunners were being dazzled severely by bright ignition tracer when using their sighting telescope at night.