Because you are shooting a CVA Eclipse with a musket cap ignition, it WILL NOT shoot BlackHorn 209 in a consistent manner do do not waste your money there. Also you would have to go to the 209 ignition to do so if you already bought some.
In loose form, Triple Seven, Pyrodex RS, Goex, APP, Shockey Gold, Pinnacle, Swiss, Graf's and Sons, are all fine powders for you. With the musket cap ignition do not shoot pellets. Pellets require a 209 primer for the best ignition.
Just keep with the Triple Seven or Pyrodex RS for now. Both are great powders and do well with the musket cap. I have shot about any kind of powder you want to mention. I normally shoot Goex or Graf's and Sons black powder 90% of the time in loose form of course. Depending on the rifle I am shooting, I will use, all the other powders as well.