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Old September 24, 2012, 04:08 PM   #5
drail
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Join Date: February 2, 2008
Posts: 3,150
The crimp is never going to hold the bullet in place by itself. Bullets jump because of insufficient case neck tension. Try this - seat a bullet with no crimp applied and press the round against the edge of your bench really hard. If the bullet moves any at all you have insufficient tension. If your bullets move then pull the expander button/plug out of the expander die and measure it. If it is not 3 or 4 thous. smaller than the bullet you are using it is overexpanding the case. You can turn it down in a drill or drill press until it is under bullet dia. I can load magnum revolver rounds and apply no crimp to them and they will not pull under recoil. The crimp helps a little tiny bit to hold the bullet but without good case neck tension it cannot hold it by itself.
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