.40 bullet size

rosco.d

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Just wondering; if I am reloading .40 S&W could I use a 10mm bullet ( .40mm ) instead of an actual .40 bullet. From my understanding the only main difference between a .40 and 10 mm round is the length of the casing.
 
So long as the cases and load data is appropriate for the gun your using, the actual bullets for 40s&w and 10mm are the same. Most boxes I've seen list both, but even if not, they are the same.
 
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