Tried using screw jag many years ago, just pulled jag off end of ramrod.LOL... I have almost all of that in my possibles bag... and I always wonder why the heck still I keep it around. Especially the ball puller jag... rofl. I tried to use that once, it was a pita. Found it alot faster to just remove the nipple, pour a couple grains of powder down the flame channel, replace nipple and fire the ball out. Only takes a few grains to get it to clear the barrel.
-DallanC
Way easier to do it your way.