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Old May 4, 2000, 09:34 PM   #9
Senior Member
Join Date: January 29, 2000
Posts: 275
Just use caution. I've used a Lee undersized die for 40/10mm and found that with some brass, there can be difficulty in flaring the case to accept the bullet. Work up loads with one set of dies, and if you change sizing dies, work 'em up again, as neck tension (which is what really holds the bullet in, not the taper crimp) will be different, which will lead to pressure differences.


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