Do the top notch shooters notice any difference in the accuracy they get by how they use the patching. That is, do they cut the patch off of a strip at the muzzle? Do they use a pre-cut round patch? Do they pre-cut a piece of the strip of patching and have a square patch?
That sounds like an ideal subject for a rigorous scientific test (double blind, etc,), broken hand. We'd need data from more than a few rifles though to make it worthwhile. And no, I'm not volunteering to do this, just pointing out it is a testable proposition.
P.S. In double blind testing neither the shooter nor loader should know whether the gun is loaded with a round patch (commercial), a patch cut at the muzzle, or a square patch. Patch material, patch thickness, powder charge, and ball diameter are constants.