Some day, a person should take some water to the range and make a 1st shot group. My old .69 is pretty consistent with the first shot- usually an inch and 1/2 higher than the subsequent, fouled group.
When using the thick .034" patches & an identical load for powder, the balls strike in line with the sights that were 'set' in 1986. With the thin .022" Canvas patch, I actually got some right windage, and of course a lousy huge group for shots 2 through 5.
With the thick, patch, the fouling is useful, one simply has to 'hold' for it. I-too leave my gun 'clean' but loaded, for the season until it is used.