Here is my take on it, but I would love to hear what some of the others have to say.
There are a few reloading manuals that have specific sections discussing reloading for the TC Contender and Encore platforms. Typically this is because the Contender or Encore frames will be loaded a bit differently (hotter, different bullet choices due to single shot configuration or non-standard bullet weights) then the traditional platform that the cartridge would normally be used in (45 colt is an example, low power loads for safety in most revolvers, higher power loads for a few stronger revolvers and break open TC guns). When you get to bottle neck rifle cartridges those differences largely disappear (the contender is often not suitable for use due to action strength). Barrel length would point toward faster powders vs slower powders listed by manufacturers to help optimize the load and reduce flash.
The contender/encore specific recipes are good references to figure out optimum bullet/velocity combinations for what you want to do. Often this means lower weight bullets to keep the velocity up for hunting, but it depends on what you want to do with it.