I have a .690 and a .715 round ball mold for 12ga. I used to shoot my 12ga tradegun with out a patch- just used a nitro card between the powder and ball and a overshot card to hold the ball in. A tradegun is a smoothbore flintlock without a rear sight. It would shoot about a 3" group at 25 yards. Now I shoot it with a patch and get better groups- but in answer to your question I would think each gun would be different and played with to get the best group. I have never tried it with my SxS , but now that it's been brought up maybe I will. Paul
