I found a .44 magnum load that is lower than the max. load for .44 special (the tables overlap in terms of powder charge). That's exactly what I was looking for, too. It's from the most recent Hornady manual. By the way, don't use special data in a magnum case -- you might get away with it (like I said, in my manual the charts overlap somewhat), but you might not due to the difference in case size.
From memory, it's a 240 gr. lead SWC over 5.7 gr. of Unique. Look in the Hornady manual to verify this, though; I'm 3/4 of a continent away from my books right now.
I cast my own bullets and wanted to make a load using the magnum brass that felt like shooting the shorter specials (I hate the ring from using shorter brass). As I recall, I was ECSTATIC about this load after I tested it. I put 10 rounds through a ragged hole at 25 yards (from a sandbag), and the recoil was very pleasant. When I get home I'm going to load a ton more.
This was through a 4" model 29. I've shot about 300 of them through the gun so far and no leading.