Howdy,
My load in my 52-2 is 3.5 231 and 148 grain Remington HBWC.
The bump up from 3.1 to 3.5 cut a already good group size in half.
Some times a person has to look around a little.
I don't know FPS but it will lead up a little however it will still be shooting good at 150-200 round mark. A pass or two with a brush wrapped in a
Chore Boy pot scrubber knocks it right out.
Good luck
Mike