Uh, ask SSK?
Or look for information on the Mini Whisper (7.63 Mauser with rifle bullets) and Micro Whisper (7.65 Luger with rifle bullets). That might give you a case volume to compare with.
P.S. The proof load for a .30 carbine was the 150 grain .30-06 bullet and the regular carbine powder charge as for the 110 gr service load.
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