A 12ga Magtech which is extruded brass has a .760 ID and the .750 would be just right for a nice tight fit. 11ga wads are .760 and 10ga are .791. I'm trying to remember because it's been a couple of years, maybe 12 or so, but it seems like I tried the 11ga wads and couldn't get a good load. The 10 will work, but you gotta really beat it in, or maybe use a good ol Mec 600. I'd think a 10ga OP wad if you're not gonna make a 750 wad and then a 11ga cushion wad, and then a 10ga OS wad glued in. You wouldn't have to mess with a plastic wad unless you wanted the added protection for the shot. I changed some numbers in my first post, I had screwed up somehow - imagine that.
I'm not sure about 10ga brass shells or what works. Harry, sounds like you now have some " fire formed " shells.
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Paul Harm
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