I finally got some .44 Spc loaded up, and I can absolutely see why y'all think so highly of the cartridge!
After some research, I tried 6.5gr of AA#5 under a 240gr cast SWC. At 15 yards, offhand, they produced a 2 1/2" 6 round group. In a big, heavy Vaquero .44 mag, it was like shooting a .22, but those fat heavy slugs zipped right through the target (a piece of scrap aluminum plate about 3/16" thick) and buried themselves 6" deep into the sand berm
Impact was a bit low and right, but I'm still getting used to shooting single action revolvers and I'm 99% sure it was operator error...I also shot a few magnums at 1350 fps just prior to trying these, so I'd bet a paycheck that I had more than a little flinching going on.
I'll try again from a rest and see what happens but 44 Special is SOOOOOOOO much more pleasant to shoot!