It’s possable the chronograph was reading muzzle blast not shot speed. They work on the projectiles shadow triggering the clock. Smoke will regester as well as shot.
I carry my Lifter station to station open with a wood wiping rod dropped into one of the barrels and small plastic bag of damp cut into quarters blue shop towels. Leaving the station push one through each barrel. Single pass not a full clean wipe.
Think you will find black powder fowling varies depending on ambient temperature and humidity as well as powder grade. Probably no need to wipe but I do it anyway. I use the lowest grade black powder purchased in 5 lb paper bags from a NSSkirmish shooter. It’s not real clean burning.
William
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