When I started looking for a load in my new muzzleloader this I bought a pound of pyrodex and 777 powder form, well in my gun 777 left a minor crud ring but nothing that effected the loading and the cleaning was a breeze 2 wet patches and the crud ring was gone and that was 9shots without swabbing(just testing). But when it came to the pyrodex after a few shots the barrel was dirty to the point where it was hard to load and I found cleaning to be way more of a chore than enjoyment. This was the case in my rifle every rifle is differnent(that's what I hear anyways). Both shoot good groups but like said above 777 is more powerful than pyrodex. I don't know a app yet we just got in here a month ago so when my pound of 777 is done I will try the app well JS Gold.