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Old September 24, 2013, 08:20 PM   #14
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Join Date: July 26, 2011
Location: USA
Posts: 1,619
223 Rem.

The fired, neck sized case, has 4% more internal volume then a FL sized case that has been returned to factory new dimensions. Soon or later you will have to bump the shoulder back by FL sizing. This small volume change may make a different in accuracy, as energy is used to expand the brass on firing. A load worked up with a neck sized case may be different when FL sized. Doing your own testing is the only way to know.
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