Try a slower powder than Bullseye.
I worked up a load for my .44mag Trapper using Unique & a Hornady swaged lead 240 grain bullet.
I wanted something in the 1000 to 1100 fps range.
IIRC, I got up to about 7 gr - about 850 fps. according to the book.
I had horrible leading.
I switched over to using 2400.
17.5 gr of 2400, according to the book, delievers the velocity I wanted.
There isn't any trace of leading either.
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