I have large hands, so I've found either the grip on a BFR Custom for large hands, FA 83 with custom grips better for most of my shooting.
The Bisley was originally designed, IIRC, as a target grip, maybe for 22lr?
The design is supposed to send the recoil back a bit straighter into your hand then a standard grip. This seems to be fine with most loads, but, with REALLY heavy loads the hump in the Bisley is slammed into your hand, and feels first like it's going to split your hand into two pieces, by tearing the flesh apart, and, the impact is what I would think a baseball bat being swung into your hand, metal one, would feel like.
With most heavy loads, the FA 83 seems to distribute the force of recoil over the entire grip, and, not so much straight back into one part of your hand.
Now, the loads I'm basing this on recoil at 40 ft-lbs in the FA 83, and 55-82 ft-lbs in the Ruger Maximum, with Bisley grip.
I can't load anything in an FA that comes close to that recoil level, so, at that level and or greater, perhaps I would find the FA 83 doesn't work, either.