I just went through the Goldilocks routine a while back with my DI-45. Macon cuts the chamber and throat with a boring bar and it's great for cast bullets (actually HAS a throat) but won't take a .4525" cast bullet loaded in a typical case after a few shots worth of fouling accumulates. Plus, it leaded the throat and gas system to buggary due to lead scraping off on the sharp, .4517-ish throat entrance. Being a unique chamber cut and having a long, tapered throat, I'm not inclined to try to monkey with the throat diameter. Finally went all the way down to a .451" die and size all the bullets within a couple days of casting to get them to about .4513". ALL leading stopped and I can go hundreds of rounds between cleanings with no malfunctions. I'm using SL-68, through, BLL goobers the gas system up when the gun cools off and makes the next first few rounds short-cycle. SL-68 shoots clean and dry so no problems there.