AT the risk of boring you all senseless....
Believe I have a load for the Public Defender sorted out. The shotgun aspect is interesting but of limited value to me... the oddball chamber dimensions presented some challenges in finding a usefully-accurate load. I eventually loaded a swaged .454" bullet and to cut down the distance the bullet had to jump, I loaded these out to 1.720”. You have to admit that the 45 Colt, loaded to this length, has a certain 19th century charm about it.
Be advised that loaded to this length, my Ruger Vaquero wouldn’t chamber them. But they dropped right into the Public Defender and that what I was after. Shoots well enough for a shotgun/snub at 25 yards. Now to perfect the zero.
More here:
http://www.thesixgunjournal.net/the-taurus-public-defender-45-colt410-snubnose-revolver/