When expanding the case for seating the bullet`s, you only want to expand the case just enough so that there is a slight bell at the top of the case mouth. This is done so the case does not scrape on the sides of the bullet when seating it. If you expand the case too much, it will shave the bullet and can crush the case as you said.
I seated wadcutter bullets so the bullet is slightly above the case mouth. This way I can crimp the case if I desired a crimp. You can also seat the bullet flush with the case and no crimp. Try different techniques to find what gives the best performance.
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Henry - Life NRA Member, USCCA Shield Member
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