I checked, it was Dixie Gun Works. 40 caliber, patched round ball, 47 grains FFFg black powder. Started with 40-inch barrel, and kept chopping it down until it was 20-inches. Fastest velocity was the longest length. Lost velocity each time it was cut. So the barrel was not long enough at 40-inches to reach that point of equal pressure for friction to take over and slow down the patched ball.
