Are you talking about the 5.5" Stainless SBH with a fluted cylinder?
I have one of those, and they handle all .44 Magnum loads.
If you are looking for some accurate cowboy loads, my advice would be to use Trail Boss with a Lead SWC. I use 7.0 to 7.3 grains of IMR Trail Boss, and it is a fun load to shoot. I try to shoot them outside mainly because they are kinda smokey, but they are accurate and fun to shoot. Load them to 1.620" and roll crimp with medium heavy to heavy crimp.
I have shot Unique out of my revolver, and I cannot get a good load from it. I think I push it to hard. I usually shoot 10.0 to 11.5 grains with a 240 grain bullet Jacket or Lead.
My favorite load for my 5.5" SBH is the Missouri Cast Bullet Co. 240 grain LSWC with 22.0 grains of IMR 4227, Win or CCI primers, Winchester brass. I can shoot apples off the poles at 50 yards with this load using the factory sights. I have changed my grip to a Hogue Mono Grip. I could hit anything with the SA cowboy grips. The cowboy grips look good, but it is hard to keep the gun under control for me. The Hogue grips make the revolver 10x more accurate for me.
One last load I like to shoot for flames and fun is the Hornady 240 grain XTP, Win brass, Win or CCI primer, and 20.5 grains of 2400. Man, it shoots flames, and hits hard. I have shot through steel plates at 50 yards with this load.
Have fun with the Ruger .44 Mag. I would trade mine or sell mine ever. I bought it the day my only son was born on 05/18/2010. The gun has never had a factory round through it. Only my hand loads.