The American Pioneer you mention were in pellet form. Were you crushing the pellets with your ramrod before you seat the bullet? I was talking to a person with basically the same complaint of poor accuracy from the APP pellets. He was told to crush the sticks first, then seat the bullet with lots of pressure. Also do not swab between shots with the APP. They claim it is not necessary.

That group with the Triple Se7en is excellent. And it appears since you asked where the crud ring forms, that you do not experience a crud ring. So you have to look at the benefit of going to Blackhorn 209. No swabbing, does not rust the barrel as fast as other powders, excellent velocity. Then the bad points... COST!! So ask yourself, is the cost worth the idea of not swabbing between shots? I clean my rifles the same day I shoot them whether they are being shot with Pyrodex, Black Powder, Triple Se7en or even the modern center fires.. So for me the Black Horn does not justify the cost. But it would be fun to play with a bottle of it and see if it makes your gun shoot as good as it does in many of the other rifles that are being shot with it.

Very nice shooting there !!!!