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Old October 16, 2012, 11:56 AM   #2
Senior Member
Join Date: December 6, 2009
Location: Hudson Valley,NY
Posts: 222

I had a similar problem years ago with a Gracy Trimmer. If your resizer is not consistant your timmed cases will not be consistant. I see variations in my resized brass caused by hardness , amount of lube , neck thickness and a host of other problems but mostly neck tension when pulling the expander ball through the neck. If you have a Micrometer case gauge you can see the variations. If the length from the case base to the shoulder varies then will the case length vary using a trimmer that measures from the shoulder.
Strive for better consistancy when resizing your brass and then trim within those variations.
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