Split 2 sides of sized case neck insert bullet of your choice just enough to hold it then chamber it
remove carefully and measure as picture. this will give you the most accurate measurment you can get.
the lands will push bullet back into case.
[img width=327 height=450]http://i661.photobucket.com/albums/uu340/OKIE2-photos/my%20guns/HOWTOOALMEASURMENT.jpg[/img]
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