Well, just an update on the subject.
I finally found some shot capsules at a local gun store....the owner didn't have any idea what they were or how to use 'em.

I brought them home and tried an empty capsule in a .38 Super case....the capsule is
way to long for this cartridge

. It takes up the whole case (no room for the powder) and sticks out a country mile.
Oh, well....it was an interesting idea.