Alaska Roy, 44Mag loads like 320@1500+fps or 240s in the 1800fps range. The 300 and 320s in the 1500fps range is the like of what JDJ and Kelley used to shoot elephant and cape with (out of a SuperRedhawk only).
These are mild compared to some numbers I've seen by a few authorities. Nothing like a long cylinder and an extra .1 inch of metal around the chamber.
The only problem with this loading practice is it is not safe if you own any other 44mags that can chamber the rounds. I have the same problem with the safety of hipressure 45colts.
check out the backissues at http://www.sixgunner.com
for Paco's Megamagnum 5 article if you want an eye opener.