Vol423,
The form of the pictured drilling is stronger than a lot of drillings made during the same time period, and it is possible that it was originally chambered for any one of the cartridges discussed( 9.3x72R,9.3x74R,9.3X72R S&S)as none of them were introduced outside the time period of the drilling.Also,I wouldn't be overly concerned about the shotgun chambers being opened to 2 3/4"in a nitro proofed drilling of this form.I don't know who this JJ person is and I can't say my opinion is any better than his, in general, and especially of a drilling I haven't seen, but he has closely inspected.The photos you provided have relieved a lot of my concerns; but in the end, if it's your drilling, it's your decision.The "double line"engraving of the caliber marking is from an engraving machine like those used to engrave plaques,etc.so is "new".
Mike
Last edited by Der Ami; 02/28/14 12:18 PM.
