That's absurd. Please do some basic research before making recommendations to others. We like to check our facts here.
Also, this is a duplicate many,
many times over. This comes up all the time. Plenty of experts trust their lives to 9mm. I used to carry a .45acp until I became better informed. Now I carry a G19.
.38spl, .357mag, 9mm, .40, .45, 10mm, whatever blows your skirt up. Any modern self-defense caliber will do its job if *you* can do yours. The differences are so marginal that threads like this make me roll my eyes.

Shot placement is key. Shutting down the CNS, etc.
Here is one duplicate thread:
http://www.zombiehunters.org/forum/viewtopic.php?f=107&t=46750&start=24I'm not going to bury this until later so that anyone else who is similarly mistaken might learn something.
Failure to plan means planning to fail.
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