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Because every 9mm I have slugged is .357. I know its not always the case, but almost everyone I've talked to in person and on castboolits forum say the same thing for 9mm and for .380.
I cast and load for seven .380's and four 9mm's, and they all have .357 bore's and get .358 bullets
The .357's and .38spl get .358-.360.
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