Greetings.
If you don't already have a .357, you really need to get with the program. My first gun was a Ruger Security-Six -- one that had been tested by a gun writer by the name of Claire Reese, in Utah.
Over the years, the two guns I think should be in everyone's collection is a good .357 and a Ruger Mark II .22LR auto. I have a friend who's a federal agent, and he told me that virtually everyone in his office, if limited to one gun, would go with the Mark II.
For carrying, the .357 is astoundingly good. When first introduced to the Highway Patrol, it was an instant success. It was a round that could penetrate cars, trucks and tires. Coming up to the rear of a test car, they blew the tire out using a slightly heavier bullet than is used today. But most people carry the 125gr JHP -- and though I've heard people complain of the flash and blast, I haven't experienced that. In this month's Guns & Ammo, the reviewer of the new Chiappas Rhino said basically the same thing. Whenever I travel cross country, I carry a loaded .357 in the car.
In all honesty, you're good to go with your .45; however, the .357 has more stopping power and much better penetration. Years ago, when the "teflon bullet" scare was being bandied about by an irresponsible media, gun writer and cop Massad Ayoob was concerned that the media would find out that the 125gr JHP would penetrate many bullet resistant vests. Fortunately it didn't, and today's vest will stop it. But the round's reputation as perhaps the ultimate handgun manstopper, combined with its excellent penetration, makes it a real winner. And the guns take some very potent .38 loads as well.
Besides, you really ought to have a decent .357 while they're still available. They're fun to shoot and make great house guns.
Just my take.
Ruger Security-Six. No longer in production, you can still find
them used. The S&W 66 also is a winner.
.