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Old March 31, 2013, 05:17 PM   #1
k Squared
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Does Winchester Size Their 380 Unprimed Brass Too Small?

Bought some Winchester 380 Unprimed Brass and loaded it with 9mm JHPs. The bullets put a noticeable bulge in the brass. I used an RCBS Tappered Crimp Seating Die.
Loading the same bullets in once fired brass resulted in a loosely seated bullet. Both sets of brass were run through a 9mm sizer die before seating the bullet, so the smaller sizing must have been done by Winchester and not my sizer.
I ordered a 380 sizing die assuming it will give me a tight seat without a bulge.
Has anyone else run into this situation?
P.S. The bulged cases feed and fired through my LCP without a problem.
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Last edited by k Squared; March 31, 2013 at 05:36 PM. Reason: Add picture.
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Old March 31, 2013, 06:17 PM   #2
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YOU CANNOT SIZE a 380ACP case in a 9MM PARABELLUM die and expect anything but what you got.
Furthermore, I ran 1M WIN 380ACP brand-new cases through the system and they were perfect to the last round, look like factory ammo, and shoot down near 1 1/4" at 25 yards from several of my 9MM KURZ pistols.
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Old March 31, 2013, 08:37 PM   #3
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+1 to Wil. You are on your way to some significant problems at this rate! You need to get a manual and do some simple searches here and the Net in general.
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Old March 31, 2013, 08:48 PM   #4
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Also, depending on what weight and diameter "9mm" bullets you used, you might be setting yourself up for other problems.
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Old March 31, 2013, 08:52 PM   #5
James K
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Briefly, bullets made for the .380 are shorter than those for the 9mm Luger. You are loading bullets longer than the case was made for so the bullet is pushed down to the thicker part of the case and bulging it.

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Old March 31, 2013, 10:03 PM   #6
k Squared
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James K,

Excellent explanation!

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