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Old April 20, 2013, 12:46 PM   #3
Senior Member
Join Date: September 28, 2008
Posts: 8,892
If you're thinking of doing this because a 3" shell seems to fit a 2 3/4 chamber, it's because chambers are sized for the fired shell, not just the unfired ones.
It's to make room for the extra case length when the crimp opens.
Where's the extra length of the 3" shell going to go when it's fired in a shorter chamber?
Lock the doors, they're coming in the windows.
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