You can load nitro in brass shells if you make the final crimp strong enough for a complete powder burn. Seeing how you're not crimping, the glued in OS card has to do it. The way I found to accomplish this is to use hot glue and make sure there's at least a 1/4" of brass surface for the glue to grab a hold of. The fiber wads seem fitting for brass shells, but a OP card and a plastic wad would also work. The plastic wad will be too loose so you'd need the OP card. If you're using low pressure data for plastic wads you'll want to go up about 10% for the fiber wads. You'll have to play around a little to find what works.
I had some of those Remington Ducks Unlimited shells and took one apart. They use a Nitro powder, couldn't determine which one it was. Now I don't even remember what kind of wads were used.
Just MHO, but I believe Remington was just CTA because some of the old smokeless loads had quite high pressures.
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Paul Harm
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