Know what you mean. Sometimes I am working hard and the group is crud but then the right load just seems to group on its own. Odd but gratifying.
Satterlee hasn't been 100% reliable for me. I got a fantastic load when I rebarreled the AX in 243 in 10 rounds (bit of luck sure) but got a real dog for the semi weight 270. Looked great but then threw occasional 3" vertical at 100 on the range. It feels a bit circular- if I start with components that are likely to give me a good load then it works quickly but if the load may be a bit flaky then it doesn't seem to be robust enough to find the narrow bands. Maybe thats the point.
That's not a view with a huge amount of evidence to back it up, more of an idle thought...