As with any gun, new or antique-type, changing any component will sometimes require further load development.

With any real black powder, a tight ball/patch combination and proper lubricant results in no need to wipe the obore at any time while at the range.

Most guns need to have the muzzle's crown addressed - radiused and smoothed in order to allow loading a good tgith combination without cutting the patch.

We can only get GOEX here, although friends in the States use Swiss for competition use in BR, chunk shooting and expecially for BP ctg. guns.

The phoney powders give greater shot to shot variations and sometimes pressure excursions along with the percolate types leaving corrosive fouling.