458 what you have shown here is exactly what
several of the folks I know /shoot with say
And some here have alluded to
And some others have let their education get in the way of
Perfessor gun will tell us what shoots well, hardness of a certain level or not
And as the PhHds all said and were adamant about being the absolute truth in all cases . . .
In dealing with higher temperatures or pressures the statement it should behave thusly should be preceeded by an experiment to show that and that it true, not known not . . . NOT based on scientific suppostition.
Thus shoot it, if it does well, that is a good combination for your gun.