This hammer drilling is early 20th cent. Caliber on recent bill of sale (by a German gun dealer) is 7x57R, and the gun chambers it. What I would like to know is if the number "248" corresponds to the 7mm caliber in a way. I need this information for gun registration. This number is just under Crown/U so I guess it was struck by proofhouse. - Jani
Typical of drillings from the period, the following sequence of marks, beginning just under the forend lug on the rifled tube, will be found representing the proof events:
Imperial Eagle Crown over G
Imperial Eagle
Crown over U
plug gauge diameter(sometimes horizontal, sometimes vertical)
I haven't seen a pic yet but from what Jani describes the much maligned "248" holds the position of the diameter of the tube. If those are the only marks, by process of elimination the "248" would somehow relate to the tube diameter.
If not "248", where is the mark for the diameter of the tube?
As far as the value for lead, assuming pi to approach infinity, and using the published data from the British Gun Barrel Act of 1868, the value for lead can be calculated.
Kind Regards,
Raimey
rse
