Kitch,
Shoot it and then shoot it some more and then shoot it some more. Try a hundred rounds or so and see we're the accuracy goes. The copper will still come out and the accuracy just may surprise you. Sometimes you have to lay enough copper down to have more consistency for each shot.
If following in O'Connors footsteps means all that much, then I doubt he obsessed over copper as much as you seem to. The man shot his rifles more than a little and didn't have the excellent solvents we have today. Think about it.
