Since it seems that tempers got hot on your question thread,I'll try to make you see things better. If your using a Lee reloading manual,when you turn to the first page of 223 Remington,you'll see a picture of a loaded cartridge at the top of the page. It has the complete measurements for every surface of the cartridge. The Maximum case length of a 223 case is 1.760",the trim length should be 1.750".While it doesn't actually state that in that particular manual,that is what you should trim your cases to. The Overall Cartridge Length will depend on the particular bullet that you are loading,but in general,the maximum OAL for 223's is 2.260". That OAL is the maximum length that will work in an AR 15 magazine,but in a bolt action,you can have them longer if you measure your throat/chamber with an OAL gauge. There's really no need in crimping the bullet of a 223 round if you have your sizing dies set-up correctly.The neck of the case will have plenty of tension on the bullet. From what I read in your post,I don't think you have your dies set-up properly.It sounds like the die is crimping the bullet before the cartridge is at the top of the press stroke. Make sure you have the shell holder in the press when you are setting up your dies. I'd take all of the dies out of the press,and then reset them up,following the instructions that came with your dies. While the Lee Manual has some good load info,most of the loads are generic and not for specific brands of bullets.That can lead to having pressure problems with certain loads. I'd suggest getting manuals for the brand of bullets that you want to shoot.The information in the Bullet mfg's load manuals are for their bullets,and it will help you more with load development. Reloading is a simple process as long as you understand that you can't cut corners,or get in a hurry.Read all of the instructions before you start loading,and take your time. Start off with minimum powder charges and work your loads up towards the maximum charges.Always look at your brass/primers for pressure signs,they will tell you when your pushing the upper limits. (Most guns shoot best in the mid range of powder charges). I was going to send you this in a PM,but you don't have the system set up to receive any PM's.