115's are fine. I prefer the heavier bullets. Pistol velocities tend to be too slow for serious hydrostatic shock. That's the idea behind a high velocity, rapidly expanding round. Even with light rounds, pistols have rather slow velocities and will never offer the serious hydrostatic shock that you get from rifle rounds. The lighter bullets also have lower BC's and SD's so they will lose that velocity more quickly, over a shorter range, and also penetrate less and are more prone to deflection when shooting through light cover. A car window for example.
I'll take a 147 grain @ 1050 over a 115 grain @ 1188.
Both develop the same muzzle energy... The 115 grain is barely 130fps faster. That is not a substantial amount of velocity to be sacrificing for that bullet mass, IMO. Also 147 grain HP's have no problems expanding at their operating velocities and often have larger expansion.