Finally got the camera working. Here are some pix. In the one, you can read 6.3. My smith won't be able to do the cast for a couple of weeks. In the pix with the caliper, the rim size is smaller than any of the American black powder cartridges that were suggested.
[Linked Image][Linked Image][Linked Image][Linked Image][Linked Image][Linked Image][img]http://i594.photobucket.com/albums/tt21/Maaax/drilling/007.jpg[/img][img]http://i594.photobucket.com/albums/tt21/Maaax/drilling/004.jpg[/img]