If you really want to know and are just not looking for conformation of what you already think you should visit John Linebaughs website.
Better still call him. He stands by his statement that a Smith will handle 80 percent the pressure of a 44 mag.
Here is an article he wrote: http://www.handloads.com/articles/default.asp?id=12
I really like the 13 gr of HS-6 with a RCBS 270 SAA bullet. It will shoot as well as you can hold and more.
Then again his recommended load of H110 will do the deed too as will 18.5 -19 gr 2400 is a good one too.
I've never found the accuracy with the light loads that some claim but that is just me.
But 6.7 to 7.0 of Bullseye with the 270 SAA bullet is showing promise. 6.7 will run 860 or so with that bullet from a 4.625 inch barrel.