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Old November 18, 2012, 05:35 PM   #5
Senior Member
Join Date: March 21, 2012
Location: Connecticut
Posts: 2,133
Lee will send you an undersized mandrel for 5$. Before ordering make sure you have the die adjusted correctly and when sizing follow the instructions, raise the ram, lower it, turn the case 180 degrees and run it up again. It does take some force, I use a lee breech lock hand press and it works well and is not overly difficult. Brass thickness and spring back will effect the neck tension a little bit but more more then running it over an expander ball. I have found much more consistent concentricity and when you get the die adjusted right the neck tension is right IMO.
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