Charlie, any wads that show friction in the side of the shell should seal well enough to avoid problems. However, don't use soft fiber filler wads down against the powder. You must use either a plastic wad or a hard card wad over the powder. The card wad should have some friction against the wall of the shell. If you use brass shells, you may have to buy 7 gauge card wads from Circle Fly to seal the powder. I have not tried my 8 gauge wads in my RMC brass shells. I had planned to use one piece plastic in them, but they may be too loose.
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