I'm not sure how you can fail to understand that this proves my point, not yours. Manufacturers follow SAAMI specs in part as a way to reduce their liability. SAAMI spec indicates that a bore of up to 0.435 is "within spec." Do you really believe that trying to fire a bullet with a diameter of 0.429 through a barrel with a diameter of 0.435 would have no effect on accuracy?
And, as is common with internet know-it-alls that can't handle being shown up, you start arguing against something that I never stated. I do not believe that this is a universal problem. It is something that a prospective buyer of a .44 mag rifle should be aware of. You are the one who claims that his is universally NOT a problem because you haven't experienced this problem yourself. I haven't personally experienced cancer, but I don't doubt that some people get cancer and that it can have very bad outcomes. That you knew nothing about this potential problem before reading this thread does not prove that it is not a problem. It simply proves you hadn't learned of it before.