3 drams is 82 grs of powder, normally 2F for a shotgun. I also use 72grs of 3F seeing how it burns faster and will give about the same velocity [ and it's cheaper to do so ]. Unless you're making hunting loads you won't need anything that stout. A nice load would be 75 of 2F or 70 of 3F and 1oz of shot. BP is much more forgiving that nitro. Don't worry if you're 5 or even 10 grs one way or the other - just more or less power and velocity, or less. You won't blow up your gun. Glue the OS card in with white glue. Any the old brass shells I have [ Rem and WIN ] , the 12ga take a small rifle or pistol primer, and the 10ga a large rifle or pistol primer - either one works. Good luck.
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Paul Harm
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