Page " The Mark VIIIz streamline ammunition had a maximum range of approximately. Mk VIIIz ammunition was described as being for "All suitably-sighted.303-inch small arms and machine guns" – rifles and Bren guns were proofed at – but caused significant bore erosion in weapons formerly using Mk VII ammunition, ascribed to the channelling effect of the boat-tail projectile. As a result, it was prohibited from general use with rifles and [light machine guns" not found :(