Hello Hatman,
Welcome to the sometimes frustrating past time of shooting "powderless" muzzleloaders.
As a "newby" you are most likely ill equipped for the task that awaits you.
You can ruin a perfectly good gun, not knowing what and how to remove a stuck ball in a barrel.
First! NEVER acid like materials in a barrel!
Second! You must protect the barrel at all times. No sharp or hard items that may score the barrel.
A good quality ball puller attached to steel shaft ( not wood or aluminium ) Even brass is not too good as the threads may strip.
A lag bolt of appropriate size works well,( 3/8" lag bolt will handle most calibers .45 to .75)
but it should have a plastic sleeve to protect the barrel from contact, should be used.
I have cut the head from the bolt, drilled and tapped the bolt to accept a full length threaded steel rod. I have also silver soldered the threaded rod to the lag bolt so that it will not separate in the barrel.
If I could post a picture , I would ??!!
The threaded rod has a large flat washer with a nut screwed in place, then I have another nut threaded on just at then end and silver soldered in place so it will not turn.
Slide the whole assembly down the barrel, careful not to touch the rifling.
Rest the lag bolt on top of the ball, give the rod with the soldered nut a good hit with a hammer, then turn the shaft with a wrench into the ball. Soak the barrel with oil.
Now just tighten the nut that turns freely on the shaft. It will draw the ball out easily.
Remember! If the ball is .50 cal. you should turn the ball puller in at least 1/2"
It sounds much more complicated than it really is.
Fred