Jim, looking at your photos, which are not conclusive, I would bet that your pistol is a 9mm.
As to why .30 cal, after WWI, returning dough boys were enticed to send their trophies in to several mailorder houses to have barrels switched out. Some were switched for longer barrels but many were switched for .30 calibre which was likely a cheaper ammo at the time.
What I think I see as proof and serial number stampings into your barrel would lead me to think it just might be the original barrel. Be careful before loading and shooting.
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