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Old April 12th, 2013 #10
Mr A.Anderson
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Join Date: May 2012
Posts: 4,481
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Loading the 9mm Luger is a bit more extensive, with a few extra steps. I assume all straight cased rounds will be the same.

Once the casing is sized, the bullet does not want to fit into the mouth of the casing. There is an expanding die that opens or flares the casing mouth to make bullet seating easier.

I've found that once the expanding die has been used (and the bullet seated), that it is necessary to use the crimp die to re-size the mouth and "pinch" the bullet in place (measured with a micrometer to spec).