In an emergency, rub it with a little sand and your thumb. Keep the bottom of the frizzen clean where it covers the pan. This will keep powder residue out of your face and help keep the priming powder dry. So, wipe your pan clean and dry after each shot - also the underside of the frizzen. To help attain consistent accuracy, load the ball sprue up and center it exactly in the bore.
Some marksman even align the mold parting line on the ball with front sight.
For a quick second or third shot, the frontiersman could use a loading block. A good loading block is made of hardwood and may hold three or more greased pre-patched balls. If you make one, be sure you have a depression that matches the outline of your rifle barrel with the ball hole centered in it. The fit to the barrel is preferred in that this centers the patched ball over the precise center of the barrel. You should also provide a small short starter of ball diameter and put a small flat handle on it.