Unclenick- Thank you very much for the information. Im not a bench rest guy and my rifles and pistols are of the hunting/sport ilk. Closer tolerance may not make any noticeable difference in my POI. My biggest concern is with the 460 already being so close to the limits of the revolver that being off the same percentage with a 40gr weight as I am with a 4gr weight will put me at +-4gr I could overpressure. I havent dropped big charges with the autodisc yet. When I do I will be weighing many of them to ensure Im within spec.
Concentrated power is not rendered harmless by the good intentions of those who create it.