The Lyman Reloading Handbooks have a separate section in them for all the standard cartridges for TC pistols. My older 47th Edition only has Contender cartridges, but maybe the newer editions from Lyman include the Encores as well now. Would at least give you the info needed to run through any on-line ballistics application for the answers you want. Either way the Lyman book is a great addition to have in your reloading room.
As SU said (Hey Glen), some of the 3rd party barrel makers offered some data at one time, but usually just for proprietary cartridges they authored or specific test cartridges they ran for whatever reason. Regardless, they don't all still make them readily available to the public due to liability concerns and only provide them to you if you buy a barrel from them in one of those chamberings.