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Old January 24, 2013, 12:01 PM   #6
Join Date: March 4, 2005
Location: Ohio
Posts: 13,718
If you only have the ability to trim before resizing (though buying a different pilot would fix that), then you want to apply your calipers to see how much resizing grows these cases and trim that much further extra short before resizing. This amount will vary with individual chambers, so you have to measure it for the particular gun and brass. Brass from a loose chamber will grow more during resizing than one fired in a tight chamber, all else being equal.
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