Okay... the time has passed for guessing...we are talking about SHOOTING this gun so it's time for the "big guns."
Do a casting of the chamber, then get a good digital caliper and measure the critical points of the casting to determine the case dimensions and compare it to the SAAMI standards to find out the correct caliber...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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