tohm Posted May 4, 2013 Share Posted May 4, 2013 I am trying to put a number that i can measure to help setting up my 550 press. I am loading 223's with Montana Gold 55 gr FMJ with the cannelure, in setting the crimp die how much if any reduction in outside diameter (difference between measuring mid neck, measuring at the crimp) should i get when setting the Lee crimp die. I am using this in an AR for 3 gun. Thanks for your help Tom Link to comment Share on other sites More sharing options...
CocoBolo Posted May 10, 2013 Share Posted May 10, 2013 I just followed the directions that came with the lee die, and it worked for me. What didn't work was the sizing die. Make sure you dry cycle a few thru the gun before you load a ton that won't extract. I'm using a taper crimp now and it works good with a .002 reduction measured from after bullet seating to after crimp. I always give them the thumb test. Measure with caliper, press round against bench firmly with thumb, measure again if it moved, duct tape, no more crimp. With the cannalure I thru the OAL away and made sure that the seating looked just like factory rounds with just a tiny bit of the cannalure showing. This improved accuracy a bunch. Developing a good load takes time, I loaded 10 rounds with BLC(2) from 26gr to 28.1gr stepping .2gr. Shot groups till they tightened up at 100 yards, turned out 27.1 was the charm. The 28.1 I got from Hornady was a bad load, the cases stuck in the rifle and had to ram rod them out. It did prove I had a good extractor cause it tore the rims off. Link to comment Share on other sites More sharing options...
Old3GNR Posted May 14, 2013 Share Posted May 14, 2013 I use no crimp on 223 loads. Link to comment Share on other sites More sharing options...
perrysho Posted May 15, 2013 Share Posted May 15, 2013 TOHM ! I just posted on your other thread. Coco gave you good advice! If you gonna shoot 400 yds you need to know a hellofabunch about match AMMO. And maybe a Bullseye Shooter to help you. JMO Be SAFE, and keep that big knotty thing on top the AR alined up straight. Perry Link to comment Share on other sites More sharing options...
Steve RA Posted May 15, 2013 Share Posted May 15, 2013 Sides of neck should be parallel, neck tension should hold bullet in place. If you don't have enough neck tension, crimping more will just make the bullet looser in case. Link to comment Share on other sites More sharing options...
CocoBolo Posted May 25, 2013 Share Posted May 25, 2013 No doubt having the proper neck tension is essential and I'm sure with a bolt gun I could be comfortable with only that but when my AutoLoader starts slamming rounds into the chamber I feel like I need a little more portection from set back, maybe I didn't get every molecule of lube out of the neck.. Link to comment Share on other sites More sharing options...
tunaman Posted May 25, 2013 Share Posted May 25, 2013 If you need a crimp for autoloaders, be sure to err on the light side as a tight crimp will certainly affect the accuracy and consistency of the round. Link to comment Share on other sites More sharing options...
Sig Shooter Posted May 26, 2013 Share Posted May 26, 2013 I use the Lee factory crimp fie on my 650. adjusted it per the instructions and it has works perfect. Link to comment Share on other sites More sharing options...
Alaskapopo Posted May 31, 2013 Share Posted May 31, 2013 Used to crimp and stopped ammo got more accurate and have never had a problem. Don't crimp its a waste. Pat Link to comment Share on other sites More sharing options...
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