just back today from shooting the last 20 shots from the box of pellets (40 pellets total).
I had a much better outing, for one I swabbed only with water and had no hangfires or misfires.
However despite very rigorous cleaning after yesterday's session the rifle would pop open after every shot. the harder I tried to stop it by cleaning the hinge areas the worse it got.
finally (despite my breech plug being screwed in firmly already) I tightened the breech plug just a little more, it barely moved, but that cured the pop-opens and I started getting some nice shooting in.
yesterday I had been swabbing with petroleum solvents and I guess that was messing up the pellets.
But Im glad I shot up all the pellets and can use only Pyrodex RS powder now.
Looks like the empty pellet box will make a nice pistol ammo container.