In keeping your barrel clean shot-to-shot, here's how they rate in my book from best to worst

Black Mag-3
American Pioneer/Goex Pinnacle (same)
777
Pyrodex Select/RS... very little fouling differential
Goex Blackpowder


FFF and (P) istol powders are finer & burn cleaner. Both can be used in any ML from 45 to 58 caliber. Weak 209 primers like CCI Standard keep the bore cleaner than strong primers like Federals.

Swab the bore as often as necessary. The more powder used ... the more swabbing. I typically swab with a Windex/Alcohol mix spray bottle after every 2nd shot using 105 gr. 777 FFF. Follow both sides of a wet patch with both sides of a dry patch. The idea is to keep the bore somewhat lightly fouled for best results in most MLs.

Of all the powders I listed, 777 is the only one that leaves a "crusty fouling". This powder usually requires bore brush swabbing to reduce risks of short-seating the next bullet when swabbing is neglected. The use of weak 209 primers and FFF powder with 777 is most beneficial.

If used/purchased correctly, 777 is the best bang for your buck. It offers clean burning when correctly used -- it's high potent & can be purchased for as little as $17.25 jug online. Worthwhile if you shoot alot like me.