While not a necessity they are nice to have. I like to seat, and then crimp in seperate steps. I use the seating die to seat, and then to remove the flare. Then use the FCD to lightly crimp the rounds. So far it has worked well.
Note you can seat, and crimp in the same step with good results. I do it with my .41 Mag rounds with good results.
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No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.
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