doublegunshop.com - home Forums General Discussion German & Austrian Sporting Guns @ doublegunshop.com Drilling dbl 16 X 10.7MM

That's a left handed drilling....unless you somehow got the pictures turned around or it has a cheek rest on both sides. I have seen that done as after market.

I don't have the best references for the older cartridges and there are few 10.7's listed in what I have. A chamber cast, as Raimey suggested, would be best and remove all doubt. Casting the chamber is always best anyway. Just because a firearm was stamped as some particular cartridge when it was made doesn't mean it still is.....ask me how I know that.