Many thanks to all of you.
Another board memeber has offerd me some 9.1X40 cases and i have some .357 max so I should be able to make something up based on all of the help and info you have provided.
As I was looking very closely at the breech face today I discovered that the shot tube was probably converted from rim to center fire. Close inspection reveals that a plug is in the breech where a rim fire pin would be. The barrel also has a small indention at the top for the rim fire. Just as the .22 barrel has.
This work appears very old.
I suppose one other theory could be that when the maker made the breech he provided for either rim or center fire. Any thoughts ? Have any of you seen or heard a conversion or a design to allow for both.
As I look at this it is not something that could be converted back and forth by a user. It seems to me that it would require skill and tools to do so.
