I have started loading 223 for a single AR-15. So far so good. I have been using a full length Lee resizing die. I have just purchased a Lee neck sizing collet die. Now I have been trolling the interwebs looking for folks that have done this. So far I have found many nay sayers and a few peeps that say it has worked for them. Has anyone here used a Collet neck sizing die instead of a full length sizing die for 223 rounds that have been and will be shot in a single AR-15? If so have they had any problems? This seems to be a bit of urban myth that the collet will not work with a semi-auto. I'm going to load up 20 rounds this way when I get back after the weekend and see how it goes. Will report back if I live to tell the tale. Thanks in advance gentlemen for your responses. Cheers, Art Wanna kill these ads? We can help!