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Two of the cleanest burning handgun powders I've ever used are HP-38 and Accurate 4100, both ball powders. HP-38 is also fairly bulky for a ball powder, at .093 cc/grain. The closer you get to max loads, the cleaner (more completely) they burn. After 20 rounds of my 44 mag hunting loads with 270 gr Speer Deep Curl and 4100 powder, the bore looks like I just swabbed it out. Immaculate.
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