my experience is a bit different...
A 4" 29 with factory targets, I can shoot it well with specials and light loads. However when you get to a real magnum load it bites me every time. What happens is that the trigger guard slams my middle finger on my right hand (I am a righty) Ive tried different hand holds and still the same result. Its hit me so hard that Ive gotten bruised and a few times a big lump on my finger that hurts for a week. Its taken all the joy out of shooting that gun. Would different grip help, maybe, I just stick to lighter loads.
My 6" 57 41 mag, I can shoot anything and not get the same result, although really hot loads, It can come close it seems. The 4" Mountain Gun again in 41 mag, isnt as bad as the 29, close but manageable.
Now, I have one other 44, a Ruger Super Blackhawk its got a 10" barrel. I can shoot all the full 44 loads in that with no trouble
I have pretty large hands and I think that might be part of the problem, I dont know for sure. I do know that I dont want to experiment with the 4" anymore, ouch!!
If I find a 6inchish 629, I will try it out. Maybe one of the ported models