When I use to load 12ga brass I always used 11ga wads. But I had a problem. BP was ok, but when trying to load nitro I always got bloopers. At the time I was using IMR PB and went to 30grs and still got bloopers - so I quit. So Jim, what kind of powder , and what are you doing with the OS card ? My understanding about shotgun shell reloading is that the resistance of the crimp is necessary for the shotgun shell to build any sufficient pressure. I tried gluing it in. No luck - so I sold all my brass shells to one of those cowboy shooters. Sure would like to find a nitro powder that works with brass shells. Paul