If I want to shoot paper patch bullets, do I have to have my chamber re-throated, or just decrease bullet diameter by the patch thickness? Thanks for any advice.

Two Bellies,
Try these links, there is a wealth of info about paper patch bullets.
http://www.iastate.edu/~codi//PPB/PPB.html
http://talk.shooters.com/room_14/topics.cfm
In the latter site just enter paper patch in the search engine, there's page after page about shooting PP. I'm considering trying them in my 1874 Sharps replica.

Thank you very much for the info, I'll check them both.