Slowhand Bob, 24229 Posted March 25, 2013 Share Posted March 25, 2013 I guess for the most part I am interested in the seating/crimping step, why are roll crimps used on these calibers? It appears that Hornady offers these with either roll or taper crimp dies. It would also seem that the roll crimp is most popular as their set of 9mm Luger/9x21 dies?? One set of my 45acp dies also use a roll crimp. How do they seat in the chamber if a roll crimp is used? Link to comment Share on other sites More sharing options...
Noz Posted March 25, 2013 Share Posted March 25, 2013 My opinion? Poorly Both are supposed to headspace on the case mouth. Roll crimp and the case mouth turns in and is no longer effective. Link to comment Share on other sites More sharing options...
Garrison Joe, SASS #60708 Posted March 25, 2013 Share Posted March 25, 2013 The proper crimp for these cartridges is a taper crimp, just digging the case mouth into the bullet slightly. A roll crimp die can USUALLY be adjusted to just taper crimp the very mouth of the case. But that means you have to be belling only a slight bit, because that crimping technique will not remove all of the bell! So, much easier and more foolproof to use the proper taper crimp die, both for 9mm Parabellum and 45 ACP, even with lead slugs. Good luck, GJ Link to comment Share on other sites More sharing options...
Jimmy Reb, SASS #54804 Posted March 25, 2013 Share Posted March 25, 2013 I have made my 45 acp into a 4 die process. #3 seats the bullet and then #4 gives it a taper crimp. Link to comment Share on other sites More sharing options...
Garrison Joe, SASS #60708 Posted March 25, 2013 Share Posted March 25, 2013 I have made my 45 acp into a 4 die process. #3 seats the bullet and then #4 gives it a taper crimp. Yeah, me too! Gives a more repeatable OAL, which is important with many .45 auto loads. Good luck, GJ Link to comment Share on other sites More sharing options...
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