From my own informal tests the 147gr penetrates less and expands more. The 124gr+p penetrated more and expanded less through clothing. Both rounds penetrated well though and expanded consistently.
I carry 147gr in 9mm because they handle barriers a little bit better. Plus the standard pressure doesn't wear the gun as much.
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Here's my credo: There are no good guns, There are no bad guns. A gun in the hands of a bad man is a bad thing. Any gun in the hands of a good man is no threat to anyone, except bad people.
Charlton Heston
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