.40 and 10mm are the same, the brass is the difference.
Also, the dies are the same, too.
You just adjust the dies a bit differently.
The major difference in the brass is the .40 uses the small pistol primer, and the 10mm uses the large pistol primer (Or large pistol magnum primer!).
Also, 10mm brass is rumored to be stronger, and it's a tiny bit longer, like the difference between .38 special and .357 magnum....
If you wanted to load for both, and don't mind using the same bullet weight, the same bullets will go in either.....
I buy 10mm/.40 165 HP rainiers by the thousand to save a few pennies....
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