I mentioned this in my other post, but figured it deserved its own attention. One gun shop guy--a former Marine--said that 9mm+P+ and .357 magnum cartridges are pretty much the same in power, ballistics, etc. I've searched the web a bit, but couldn't find any comparisons and no ballistics for 9mm+P+. 9mm+P seems substantially less powerful than .357mag. How much more powerful is +P+? The guy also said that ammo technology has improved a great deal in the past 20 years, and this is why 9mm's are able to approach the power of .357mag. All I know is that 9mm is almost exactly the same diameter as .357.
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