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All RCBS and Hornady bottle neck dies have a roll crimp built into the dies. To not crimp you have to run a resized cartridge all the way up screw the dies body down untill it touches the neck. Once it touches the neck now you back it off 1/2 turn. If you do not do this you always crimp your rounds.

Do you need to crimp not really. If I was using a semi-auto I would crimp ust to be on the safe side. All my 223 rounds are crimped not much but just enough to count.
 
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