Ghostrider,
I made comments on GGCA forum. I only viewed 1 page of photos and didn't see the underside of the barrel. It may have been rebarreled rather than rechambered, as I opined there. In any case it became 8x60 in 1930 as stated by Raimey. If the barrel has the serial number, please post a photo. If there is no serial number, or if it is a different font; it is likely a new barrel.
Mike