James- shooting instead of cleaning is mainly why we found loads (ball/patch combos) that don't require wiping. how you measure the pach thickness is also important. One person's .020" might only be .017" with another method of meauring. I generally find .003" difference between calipers and my michrometer when measuring the same piece of cloth. tightness of the weave is another factor in patch integrity.
Since it's easily obtained here, we almost all use pure 100% denim here. 8oz. is too thin for most rifles except with balls that are bore size or larger still, while 10 oz seems to work in most everyone's rifle with a ball that is from .010" to .005" smaller than the bore.
When I measure store-bought ticking patches, lubed or dry, I get readings .003" to .004" smaller than what the package says with corresponding results- poor. I ordered .018" and they were way to thin with burn lines. They mic'd only .014". After going back to my normal 10oz denim which measures .0215" for me, accuracy was restored and fired patches were reusable. Some makes of 10oz. measure only .019" to .020", so one must try several. When you find one that work, buy 4 to 10 yards of it so you'll not run out. This running out of patch material usually happens when the store is out of that brand or weight.
I have never had a gun that worked better with a thin patch. I've never had a gun that worked as well cleaned betwen shots as when shot dirty & I've had more than a few. All the guns I've had or other's guns I've worked with, shot perfectly without wiping, never building fouling from shot to shot.
Learning to shoot BP guns is a long curve - the learning curve. Studying books like Ned Robert's book, "The Muzzle Loading Cap Lock Rifle" can be a quick way into shooting all day without having to wipe. One merely crowns his rifle smoothly, then picks a ball/pach combination that goes to the bottom of the grooves.
If the ball's diameter, pluss 2x the thickness of the patch does not measure out a couple to .004 larger than the groove diameter measurement, it cannot shoot 'cleanly', as in; "Ven yu loads der next von, yu cleans der last von.