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Old 02-12-2013, 3:48 AM
rsrocket1 rsrocket1 is offline
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No real need for a crimp on the 10mm. Neck tension from proper resizing is sufficient to hold the bullet in. If you are expanding the case prior to seating the bullet (and it should be a very tiny flare, just enough to get the bullet started and not shave anything off as you seat it), then the "crimp" is used only to bring the case mouth back to vertical or barely inward. The 10mm headspaces on the case mouth so you don't want it to go in very much.
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