If you have gas leakage with a certain powder, you don't keep using it. You find a faster burning powder to solve the problem. Get on the website that shows burning rates and find a faster powder. I think I am giving good advise, but maybe I am being too critical. I don't want anyone to be disappointed in their reloading experience. My advise is to throw away your old loading manuals, ignore 12 gauge data, and find a source of Red Dot. Greem Dot is too slow for slow 10 gauge loads and you will continue to experience leakage.
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