I use 4198 as Sherman Bell recommended - 40% of 4198 of a BP load. That would be 24 grs of 4198 in my 40/60. Being a little cautious seeing how I was using a rifle barrel liner in my 10ga Remington and it was what I thought a bit thin, I started at 20.5grs and settled on 21.5grs. I also used some cotton balls for filler. The 40% formula seems to work just fine. Mild recoil and good groups.
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Paul Harm
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