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Discussion Starter #1
This may be a really stupid question, but is it possible? I just ran out of 115gr fmj 9mm bullets, but I do have a box of 95gr fmj .380's. These .380's are labeled as .355" dia instead of .356" like they usually are.
Is there a difference between .355" .380 and .355" 9mm?
 

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Yes there is they'll keyhole and crimping the 9mm case enough to hold the .380 bullet will probably give you head space problems.
 

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Yes there is they'll keyhole and crimping the 9mm case enough to hold the .380 bullet will probably give you head space problems.
If both bullets are fmj .355 dia, why would it require more crimp? Same question with the keyhole. Same dia, why wouldn't it fly straight?
Not doubting your judgment by any means, sir. Just trying to learn. I thought it might not work, just wanted to know exactly why it wouldn't.
 

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go ahead. several of my reloading manuals show the same 90 grain bullets used in both loads. i personally have loaded plenty of 90 and 95 in 9x19 cases for practice.
 

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Yea my bad, I shouldn't drink, read and type.
 

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The 9mm & 380 have the same bullet dia. SO you can certainly run 85-100gr 380 bullet thru the 9mm, the 357sig as well. The load & crimp the same as heavier bullets. Finding a good OAL may be tricky.
 
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