I've tried without success but believe Charlie has with gluing in the OS card while putting pressure on it. From what I've read, the crimp is what allows the shell to build pressure. Without the resistance of the crimp you'd just get a dud. When I was loading 12ga brass shells with black powder I always used 10ga OP wads, 11ga cushion wads, and 10ga OS cards. The 10ga OP wads in itself gave plenty of resistance. You may have to go two sizes larger with the OP and OS wads. Just some thoughts - good luck. Paul
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Paul Harm
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