Otto-

Thanks.
That's what I expected to hear. For the sake of this conversation, how much movement have you seen to be possible with this technique?
Have you gotten rifles which print right and left barrel groups, say one on top of the other but not converging anywhere (resembling a figure'8')to print to the same center with this method?

I'm with you on rifling wear and careless and/or improper cleaning rod usage.
This gun's likely over 125 years old and shows it's scuffs and dings inside the bores. It took a bit of work to simply get the rifling lands to terminate on the same plane for each barrel. As I'm not yet at what would be 'the load' for this rifle, it's not an issue of -redoing the load- I'm still at it and hopefully this work will help me get there.
I am though very interested to see what simply having gotten the crowns to appear more like crowns than buggered orifices will do to how the rifle shows up on paper.

--Tinker