Some people warn against the hot 125 loads in K frames saying they cause flame cutting and cracking on the forcing cones.
One of these days I'm going to find out who these " people" are. If it says .357 shoot it. The one caution on the 19 is : It's not designed for day in, day out shooting with .357. It was designed foor the LEO who pactrices with 38 special., shoots a few cylindes of .357 ammo. and then gos to work. The L frame is designed for a steady diet of .357
Perhaps not better, but more. Look at the very bottom of the forcing cone on a K-frame and compare that to an L-frame. See the flat spot on the smaller barrel? That is the stress riser that causes the forcing cones to crack.Wouldn't that happen on all .357's then? That theory has been disproven because they don't use better still in the L frames than the K frames.