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Mad Reloader,
Ken Howell’s Designing and Forming Custom Cartridges for Rifles and Handguns gives the CIP standards for the 8 mm Gasser case:
Rim diameter, maximum .3811”
Case diameter just ahead of the rim, maximum: .3386”
Case diameter at the mouth, maximum: .3370”
Rim thickness, maximum: .0433”
Case overall length, maximum: 1.0630”
Robert Amadek’s Pistols of World War I gives a cartridge overall length of 1.475”
Should you be unable to resist firing this old timer, I’d advise you to slug the barrel and carefully measure the chamber throats. Nominal bullet diameter is 0.319”, but actual sample ammunition I’ve measured after teardown used much smaller bullets, sometimes as small as 0.312”. Also have a careful look at the forcing cone. To put it kindly, some European revolvers of this vintage, even "good" ones, have very odd geometries there...
Bob
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