Actually Mohawk in the late 70s the 357 magnum in the 125 grain "Hollow Cavity", was very popular in Law Enforcement. The Hollow Point is just that. The point of the bullet is hollow to pick up on the hydraulics of body fluids for expansion purposes. The "HOLLOW CAVITY" was a more dramatic expansion, and meant that more than just the point of the bullet was hollow, i.e. part of the bullet BODY was also hollow. I carried these for many years in a Model 19 Smith, and as I recall Sierra was the main manufacturer of them.
They would turn a cottontail wrong side out.