If I am loading for a AR (.223) and the bullet has a cannalure like the Barnes M/LE 62gr. or the Remington 62gr Match bullets do you HAVE to crimp the cannalure? I dont crimp any of my bullets (im new to reloading). I just load for accuracy and they seem to work fine but havnt tried the bullets with cannalures. Do you have to crimp bullets with cannalures or can you just seat the cannalure just above the top of the case neck (or below?)without crimping. I have a set of Forester BR dies. Are all seating dies able to crimp or just the specified ones. I read in the Speer book you back off the die 1 single turn for not to crimp. Thats what I have been doing, now if you dont back it off 1 turn it will crimp the bullet?