[quote=“DocAV”]The Case is an Iranian 7,9 1950/1951 date case ( Persia/Iran uses the Hegira Year (different from Turkey) 621.5 CE (July) ) for its dating system.
The over-the-shoulder sleeve is a very “iffy” method of making blanks with an extended profile, as this sleeve can separate in the chamber and cause all sorts of problems, unless soldered in place.
Whilst it will not “go down the bore” on firing, (due to the “shoulder”) it can “come loose” due to Gas re-circulation on firing.
The Initial British .303 Blank back pre-WW I, with a crimped-inside-the-neck sleeve was also withdrawn for this “profile shedding” propensity…the profile going down the barrel and acting like a bullet ( although hollow and sheet metal fragments)…
AV Ballistics Film Ordnance Services[/quote]
Just to add a few notes on blanks with separate mock bullets, and to clarify a little on DocAV’s remarks.
The .303 blank that Doc is refering to is the “Cartridge Blank .303 inch Cordite with Mock Bullet Mark VI”, and of course was not the initial .303 blank, that having been the rolled case Mark I. There had also been three marks of black powder and five marks of cordite blank prior to the Mark VI.
The Mark VI blank consisted of a normal rosette crimped blank with a mock bullet made of thin sheet brass crimped over the neck, not inside. The case was blackened for identification. It was introduced in December 1901 but by 1904 reports were being received of the mock bullets remaining stuck in the barrel and of live rounds being mixed with blank. Never a good idea!
In 1906 the Royal Navy removed the mock bullets and the army followed suite in February 1907. The round then effectively became like the preceding Mark V blank but was now titled “cartridge SA Blank .303 inch with mock bullet removed Mark VI”
Pictures show bothe versions of the Mark VI Blank.
The idea was not new though. The final picture shows a very early British .303 blank, probably dating from around 1890, with a rolled case covered in cardboard and a brass mock bullet. presumably this was tried as an answer to the problems of using the short stubby rolled case .303 blank (shown alongside) in a magazine rifle.