Lyman's data for their 100gr cast bullet from the "One Book/One Caliber" compiled load book. This should give you a place to start. Plus 2 gr doesn't make much difference in bullet wt. just start at the start level listed and work up until you get leading or the accuracy goes to pot. Don't worry about reaching the max load listed for this bullet as they go as high as 5.7grs of Unique with their 115gr bullet.
It doesn't take much powder to send those light lead pills out the muzzle pretty fast. It is going to be a balancing act between velocity needed to function the firearm and barrel leading.
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