First off, a Remington hull is tapered wall hull[ Win also ] where as the Cheddite is a straight walled hull. That's why the powder is leaking by. Many recipes show a wad for a tapered hull used in a straight walled hull, but you see the problem with that clear hull. Even Claybusters shows their Win/Rem wads being used in straight walled hulls and they make a wad for straight walled hulls. Don't ask me why they list them. Any hull except the Rem/Win is straight walled. To the best of my knowledge the 10ga, 16ga, 20ga, 28ga, and 410 are all straight. The only exception is the Win AAHS hulls. They take a special wad. Second, the RP12 wad is meant for 1 1/2oz of lead shot in a tapered wall hull. Go to BPI and ask what wad to use for a bismuth load. It's different than a lead shot wad. Make sure you mention if they don't ask what hull you're using.
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Paul Harm
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