puntosaurus and ylhelico,
The flight manual limits are established by landing on ever increasing slopes until the lateral stick stops are contacted. I have never heard of static rollover margin being lower than stick margin.
The Static rollover angle for most helos is far greater than the slope limit due to stick margins, almost never is the static rollover the limit to slopes. A typical stick margin limit might be 8 to 16 degrees (measured as the maximum slope one can land on without touching the lateral stick stops). A typical static rollover angle might be 30 degrees. One can calculate the static rollover angle by simply drawing a cross section of the helicopter, with a line through the cg extending thru the skid or wheel. Here are two examples:
Remember, the actual slope capability on any given day can be less than the flight manual limit, because the wind and lateral CG as well as the slope material (friction coefficient) all affect the true capability.