I don't buy this stuff at all.
Metal screws have a very small amount of variation due to the elements.
Yes, contraction in extreme cold, and expansion in extreme heat.
But wood is much more effected by the temperature, the humidity, the type of wood...
To say "all metal screws, in wood, should be at 6 o'clock, regardless of all other factors is nonsense.
Ever had a door that sticks when the humidity is high...but it works fine with just a small adjustment of one or two screws...and all the hinge screws are not perfectly in sync?
It happens every day.
If a gun maker tried to use the notion of "all of our grip screws are clocked to perfection", I would walk away.