Exactly, load/gun combo problem, with the problem being the light bullet weight. The only thing that is changed is the bullet weight, rest of the load is the same, including the diameter. Same powder, powder charge and primer produce excellent groups with the 125 and 158 bullets. In 50 years of reloading, this tells me that there is something about the 105 gr. bullet that my guns don't like, so I don't use them. The only reason I mentioned it to the OP is that not every revolver will shoot a certain type of bullet well, maybe try a different bullet.