Federal prints the following on the Heavyweight, Flight Control shot shell boxes:
"Best performance achieved with chokes that do not strip wad or reduce muzzle pressure."
Shorthand version: Do not use ported choke tubes.
With the RSF, you should see patterns in the 130-135 range in a 10" circle at 40 yards. More if you have polished the barrel. Some folks have tried the ported Jellyhead chokes with good results, though.
Good luck.
FullChoke