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Old June 13, 2011, 08:22 PM   #9
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Join Date: January 5, 2009
Location: Just off Route 66
Posts: 4,897
This is just a wild guess, but since the mags are new, you may be experiencing a problem with the size of the base of the cartrage. Most companies will recommend that you use a X-Small Base full length resizing die. I use a RCBS one and no more FTFs. The other thing is to bump the shoulder of the case to the correct spec's. This is done by using a case length gauge when setting up your dies and press.

This is a case that needs to be bumped. Does make a difference.

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