I worked up a bunch of test loads for my CZ 527, Hornet. I used IMR 4227 and IMR4198 and WC820. I didn't have any load data for the WC820 so I used AA9 and worked up very slowly. The WC820 is a medium burn powder that works well in hand cannons, 44 mag and 45 Colt.
I was really impressed with the results for both the 40 and 45 grain bullets. I used both the Speer and Sierra spitzers. The results were close to that of 296, and H110. Group sizes were unbelieveable. The velocities were higher then the IMR powders, but that was not what I was looking for. I wanted accuracy first, the speed came with it.