I don't have the links anymore but there are also those out there who will make custom size molds. You might check with mfgs such as Rapine or check on the NSSA site for links to possible suppliers as well.
The .75 instantly brought to mind a Brown Bess but since you aren't going to let the cat out of the bag, we'll all just have to conjur up thoughts of what you are talking about and kind of guess on your needs. As already stated, you'll need to know the exact size your "weapons" will take. You're going to need to know that before you start your hunt . . .
1 inch huh? With the present "social climate" in this country, I certainly hope you aren't having "muzzle loading assault weapons" being made . . .
