That's exactly what happens and when using flint or percussion, NEVER an ignition problem, even with OVER 100 shots fired, with no cleaning, wiping or swabbing occurring.
As shooting progresses, the mark on the rod climbs up out of the barrel when the ball is seated with the same 'thump' as normal. The ballistics remain exactly the same, as well.
Stands to reason that if you don't wipe the breech, fouling MUST build up there. How could it not? The area where the ball sits and forward gets WIPED every shot while being
loaded - how could it not get wiped? it gets wiped right to the bottom of the grooves and corners. When there is compression of the patch in each groove, each groove gets wiped.
I clean my guns AFTER I get home and never at the range, unless it is a multiple day shoot, then after the shooting, then a beer or two are over. THAT's when to clean. When
shooting, I am there to shoot, not to clean.
The cleaning bucket gets grey-ish after cleaning. It is darker grey after cleaning the .69, just due to the volume of the bore I assume, even though I shoot the same amount of powder in my
Beck .50 & the .50 has a much longer barrel. The difference is not great, though. There is a huge difference between the larger bores, and the .36 that shoots only 35gr. of powder. It's also
the easiest shooting, especially with bore sized balls. The smaller the ball, the less lead there is to move. The water bucket after cleaning the .36, is drinkable. It will taste somewhat sulfur(y).
The solids will sink to the bottom.
I grew up drinking sulfur water out at the farm where I hunted from about 10yrs., old on. Some people called it mineral water. It was well water, likely from a aquifer running over sulfur deposits.