I like Hydra-Shok, and it is very proven in law enforcement. I have some 130 grain, but usually carry the 158 grain, because I want penetration into vehicles and into large, fierce dogs. Federal designed the 130 grain load with the idea that it would be used by civilians, who would usually be shooting into the frontal chest of a holdup man. Probably works okay in that role, but don't know how deep it will drive in crossbody shots or in big dogs, who have very tough musculature.
Recall the penetration problem the FBI had in Miami? I factor that in as I seek ample expansion.
Hydra-Shok shoots very well in my S&W M66. I also like Gold Dot, but the copper jacket tarnishes and looks bad after the rounds have been carried in the gun for weeks at a time. And I'm unsure how quickly the 158 grain Gold Dot opens. I don't use 125 grain .357's. Too erosive to the forcing cone of revolvers, and may not penetrate enough, depending on the bullet in question.
125 grain ammo was the reason why Smith had to bring out the L-frame guns; it was wrecking K-frames when used heavily. But factory (S&W) reps told me that K-frame Magnums endure much better when fired with 158 grain ammo.
Lone Star