I used to dismiss this as a .44 hot load thing with my 629. But with my recently acquired 625, I also get injured. After say 30-40 rounds my trigger finger is always bleeding. I don't shoot revolvers enough to develop a callous though. The spot that always gets opened up is the third knuckle (closest to the fingernail) on the left side. What must be happening is that my finger is impacting the bottom of frame during recoil. Is my grip is wrong? Do I just need to shoot it more and build up that callous?