Thanks for that Mike. I've never used PP bullets so I've been reading up on it; The Paper Jacket by Mathews and I've read all I can find on the forums. It seems like PP bullets are made less than bore by .002 to .006 thou and then patched to a couple thousandths over bore. At least that's what I get from my reading.
My bore is .450" at the breech end and .444"+/- at the muzzle. The groove is somewhere beyond .470". Can't slug the that much diameter.
That's why I'm curious what the originals are.