Well your Encore and old CVA are two different types of rifles. Roundball are not going to work real well for you in the Encore. As for powders, you could try Triple Seven 2f, or BlackHorn 209 if you want a cleaner powder. Triple Seven can clean up with simple water. Blackhorn 209 requires a solvent to clean it up. In fact water is not recommended to be used with it at all.
A good projectile might be a 200 grain .40cal XTP or Shockwave in a blue sabot, a 250 grain .452 Shockwave in the black short sabot, Barnes projectiles, 300 grain Hornady XTP's in the proper sabot and loads of powder between 100-120 grain. It should work well. If you shoot BlackHorn load 90-110 grains and try that. Be sure to use a good primer and swab the bore between shots. Good luck.
A good projectile might be a 200 grain .40cal XTP or Shockwave in a blue sabot, a 250 grain .452 Shockwave in the black short sabot, Barnes projectiles, 300 grain Hornady XTP's in the proper sabot and loads of powder between 100-120 grain. It should work well. If you shoot BlackHorn load 90-110 grains and try that. Be sure to use a good primer and swab the bore between shots. Good luck.