I am only loading 15.0 grains of H110 in my .357 because my revolver is my old Model 66 K-Frame service gun, and I don't want to run it too hard. However, I am still getting 1170 fps with a 158 gr. XTP out of its 4-inch barrel. It's a conundrum that you are getting essentially the same velocity using 1.5 grains more in your longer barrels.
