Just a thought here, considering how difficult theses particular bullets are to resize (pretty tough they are) and considering how lazy I am, that I really don't want to take the step of resizing at all (which is why I designed the pro to shoot any 45 cal bullet) in the first place, at what point does resizing a 458 bullet pass the thunk test? If it's, say .454", why not let the bore resize the rest of the way. Only have too resize once! Again starting low on the pressures and then working up.
I have refreshed chambers right now, in the shop, that allow me to shoot any 45cal out of a .4515 bore and I personally see no increase in pressures/bolt thrust. I have done this bore resizing since I was a single digit kid, did it with the 9mm too, shooting the .357/.358 bullets out of a 9mm bore barrel.
This is not my idea, I must admit. As a mere child I read every wildcatters hero, P.O. Ackley and in his books he was doing all this bore sizing, reporting no discernable pressure increase and he was doing it like us, reading the tea leaves signs on the case/primer.