Howdy
Believe it or not, different powders leave behind different amounts of fouling.
I used Goex for years, both FFg and FFFg. Then I discovered Schuetzen. Schuetzen is made with a superior grade of charcoal, the same type that is used in Swiss. But Schutezen costs much less than Swiss. This makes Schuetzen cleaner burning than Goex for almost the same cost as Goex. These days I only use Schuetzen. It is made in Germany by Wano. At the end of a day of shooting, it only takes a few wet patches down the bore to clean my guns, cleaning with Goex always required more. Graff bottles their own brand of powder, but it is really Schuetzen in their own bottle.
I load Schuetzen in 45 Colt, 45 Schofield, 44 Russian, 44-40, 45-70 and 12 gauge shotgun. I am not so particular about the shotgun, I use any powder I have on hand for it. Recently a pal sold me a few cans of Goex FFFg. I used it up in shotshells.