It can be dirtier, but I must say not any over 700X. Even WST leaves residue within the barrel, so no bid deal. Alliant Reloder-25 Come across load data for Accurate 6001 propellant by clicking the button "Loads for this Powder".More about this powder:This advanced powder for big sport searching https://alliant-red-dot04713.theisblog.com/13535247/about-alliant-red-dot