Quote:

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before the war the old K.u.K. army was using the "Kapselschießeinrichtung" ( very hard to translate)
for short range and also indoor shooting practise.

and hard to find pics also, it was an insert, lathe turned from solid brass with a propelling charge looking like a big primer ( the Kapsel) and a 8 mm lead bullet bullet with a hollow base you set on the tip of the insert with a special pliers.


http://old.municion.org/8mann/8mann.htm

"Reusable reduced shot cartridge for training. Instead of a piston, a small 4.5x9 mm HP adaptor blank cartridge is inserted and a lead bullet of very small size and weight is manually inserted. It can be used in the ordinary gun without any modification. PHOTO: TONY"

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Rather reminiscent of these, from 1939 Stoeger catalog: