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Old April 6, 2013, 06:33 PM   #16
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Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 5,026
There is the primer anvil with priming compound between the anvil and the primer cup. It takes a lot of force to punch out a primer and the de-capping pin has a small diameter. Therefore a lot of force per unit of area will be applied and there is no way that the anvil will not be deformed and priming compound not displaced.
A deformed anvil would not necessarily be a problem, as long as they are still in the primer cup when you re-prime with them. When I looked at live-deprimed primers under magnification, I could not see any deformation. As to priming compound displacement, if it does not fall from the cup, there is likewise no problem. "Pre-stressing" the primer compound (slightly displacing), by seating the primer further than flush and slightly flattening them has been a technique for improving accuracy for years.
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