My two cents:
I think it's more if the grips are fitted to your size hands then what grip you get.
My experience was with loads heavier then most shoot in .45 Colt.
My cut line was 325 grain bullets @ 1350 fps. At that point the recoil was enough so I needed custom grips.
Your cutline may vary.
I have shot VERY heavy loads in .500JRH with the custom grips on a BFR with no problems at all.
The Bisley grip, at a certain point, feels like it's splitting my palm in half. However, that's with loads that recoil at 80 plus ft-lbs.
The plow handle grips, or the Bisley grips, are fine, provided they are tailored to YOUR size hands. The FA 83 grips are fantastic as well, as long as they are customized for your size hands.
I've had custom grips put on a .45 Seville, .500 Ruger Max, FA 83's, BFR's, and the difference has always been huge.
If you are lucky enough to have the standard grips fit your hands, your home free.
The only ruger I have with custom coco bolos not fitted to my hands is a .22lr Single Six.
I'm thinking of selling it.