Nice piccys Dave,
i have a couple of the same type of brass base plug, wasnt sure from what gren they came from.
Also, did they use a different type of detonator? I say this as the usual type was fired as you know by a .22 rimfire which might not go off if hit by a striker with a centre point. Didnt know it they made a centre fire round as small as a .22. Been thinking about this for a while now.