Lag and Miller. Your replies motivated me to break out the Jeffery and my camera. I will attach a couple pics of the gun and it's proof marks. As stated, it appears to be originally 10 bore chambered for a 3 1/4" brass case and black powder proofed with an overbore of 10/2. For the reasons mentioned by Lag,obsolesces,
and the desire to put it back in service,the chamber was lengthened to 3 1/2", and magnum nitro proofed a couple years ago. I can confirm that it does a fine job with 1 1/2 oz. of #2
Bismuth.
Terry
