Helps clean the lead.
I find 800+850 degrees will pour anything I need from an aluminum mold.
Using a 10lb pot I put in a ball of wax around .400 diameter and a stir.
At that temp a flash and burn off most likely will happen. Skim.
I had a new Dragoon that was that way from the factory. Even putting pressure on the ram with it between cylinder bore wouldn't budge it. Had to strike the back of the cylinder with a hard plastic mallet to get it apart.
Once apart I inked the arbor and very minimal fine filed the contact point...
I loaded 10 cylinders. 5 with filler, 5 without. Over sealed ball. Mixed the cylinders so there was no way to know which had filler. Shot all 10 cylinders. Zero change in accuracy.
Put the powder in. Ram the ball. Seal and shoot.
My Walker shot around 8 high and 8 right at 25 yards.
After measuring the cylinder bore was too close to same as barrel bore. I reamed the cylinder to .451 and it was better. Then I increased the length of the forcing cone and polished it along with some minor crown clean up. It now hits the...
Pyrodex is fine. I prefer the "P" grade.
I find 22-25 gns provides very good accuracy and punch. #10s is the fit.
The .454 ball will get you a nice ring of lead when rammed.
I suggest to over lube the ball. I've used an 80% hard wax to 20% veggie oil melted and heated to hot enough the veggie...