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The No.8 Switch cartridge was used in an anti-personnel booby trap. The trap was buried in the ground and when trodden on fired the steel conical projectile through the victim's foot.
No.1 Mark I Ball
"Cartridge S.A. No.1 Mark I" was to Kynoch design drawing BK/167/170 dated 25 May 1940. it was also known as the ".40 inch Switch".
The case was based on the .351 inch Winchester Self-Loading case. Early production featured the remains of the extractor groove as they were made from .351 inch cases that were on hand, but the bulk were new made cases and had no extractor groove.
The bullet was turned solid steel in a conical shape with a rounded point and blued. The later type had a blunter radius to the point than the earlier type.
No details of the propellant charge are known.
No.1 Mark I Blank
"Cartridge S.A. No.1 Mark I Blank" is presumed to have been a training device but no firm details are known.
The case was as for the ball round
The bullet was wood, shaped to conform to the ball round.
Even if it had a wood bullet, it must have been an unpleasant device to step on!
Below, Kynoch drawing BK/167/170 showing ball round with steel bullet. Left; early type, right: later type
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