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Use of beveled base bullets of hard alloys may be you the root of your leading issue, especially if they are less than bore diameter. Their hardness keeps them from obturating at moderate pressure while the beveled base directs gases up and around the undersized bullet, the heat of those gases leave lead deposits. A flat based design of a softer alloy could likely ease leading considerably. Plain based designs overall should be held to 1400 fps or less for best results.

Slugging your bore could still be beneficial. In the past, some Rossi bores have been found to run .431 or even .432 inches. With straight walled cases, simply trimming cases to a uniform length has helped me to moderate pressure and increase accuracy in several cases.
 
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