I know some of you on this board are really knowledgeable on Drillings, and I just bought my first, and I would like a little help on figuring out what I got.
I would like to know anything about the builder and especially about the rifle caliber. I know it is in the 8mm category, but that is as far as I can get without plugging the chamber with "Cerrosafe", which I'll have to buy at $28.00 + shipping, from Brownell's. So, I thought someone might know, from the markings on the flats, what caliber it should be. I have taken some pics that follow.

Thanks
binko