If a bore is crooked and cut on a curve or spiral, a perfectly cut flat crown will not be square with the bore axis. I believe this is the reason crooked but muzzle/breech centered bores shoot wide of sight center
I have been trying to visualize what you are trying to say there. :idunno: No offense, it might be a perception problem, not an explaining problem. I'm just bumfuzzled at what you are trying to say.