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Old January 26, 2021, 10:42 PM   #5
JT-AR-MG42
Senior Member
 
Join Date: December 27, 2008
Posts: 548
If I felt the need: (which I do not !)
You would first turn down the rim to .380 spec in your lathe,
then run the case through a swage die to reduce the diameter,
and then trim to length.
Last step would be back in the lathe to re-cut a proper extraction groove.

A simple water test would give you an idea of the reduced capacity of these new cases and so you'd
want to reduce charges for load testing.

JT
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