Mickey wrote:
"I was referring to the traditional velocities of the 470 and the 450's. The .458 was supposed to match those, it didn't."

I've always wondered whether the 470 was lucky enough to establish its reputation in the days prior to widespread use of a chronograph. I have a suspicion that from day one the 458WM may have been closer to (if not exceeded) actual 470 ballistics then its given credit for.
Cheers...
Con