Hi Spotter,
Only just caught up with this thread. Thats quite a change from the item i saw at Beltring, looks really good. I have a little information on these rounds, they were launched by a hollow wooden bulleted blank of 7.92 and or 7.92/13mm,
The action of these rounds is such that on acceleration the arming sleeve sets back, compressing its spring, and is prevented from rebounding by the arms of the retaining spring entering the internal groove near its head. The coiled steel strip is then free to expand so that on graze the pellet passes through the coil and the needle pierces the flash pellet. The flash enters the detonator in the gaine which brings about the detonation of the bursting charge with the assistance of the exploder. The functioning of the fuze, as a result of the strike of the impact cap brings about the detonation at the effective point relative to the surface struck and the hollow in the head of the charge results in the concentrationof the effect of the detonation to obtain perforation. The steel disk under the cap is probably intended to prevent debris from the cap entering the liner.
Perforation performance is given at 50mm, on homogeneous hard armour with a strike at 30 degrees to the normal, making a hole 5/8th" by 3/8th"
This info have been taken from the War office handbook of enemy ammuniton 1944.
Best regards Weasel.