I hate to re-use a post in the other thread.... but it fits to darn well not to......
The way I look at my self defense pistol comes form two friends I have the the Dallas / Ft. Worth area. They both are United States Air Marshals, I happen to have the same pistol that they carry on air craft a SIG P229 in .40S&W.
The U.S.A.M. Service has switched to .357SIG so I have re-barreled mine also to the SIG .357 P229
The service supplied ammunition is .357 SIG Speer Gold Dot Hollow Point, which I now carry in my pistol also.
Though I to hope to never - EVER need to draw my side arm in self defense, should I need to, the gun is unmodified, no wolf springs, no fancy toys, but straight SIG from the factory, using the same pistol and ammunition that the FEDERAL GOVERNMENT uses to protect us all.
Think of it as a first step in the anti-sleaze lawyer defense, in the after math of a defensive shooting. With the gun being unmodified I can not be portrayed as some psycho-gun-nut that altered his weapon to see who well it would shoot humans.
I suggest you research what your local Police, Sheriff, State Police or other government agency uses and match what they use for hardware and ammunition.