Thanks for the explanation John.
W10085,
Some will tell you that vertical stringing is a breathing thing. I'm not sure that really applies to shooting from the bench. However, an inconsistent hold can affect vertical point of impact. I also believe that the slower ignition of most black powder guns compounds this. It gives your body more time to react to recoil before the bullet exits the muzzle. If your grip isn't the same every time, the muzzle can rise more or less than it did on previous shots. Just a theory of mine.
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