So a couple buddies of mine came over the other night for a little reloading session. They brought 223. They, nor I, have ever loaded 223. They brought some RCBS trimmer/cleaner/some big green thing. Worked pretty good. Everything went fine. At the very end when it was time to crimp the rounds we had a hard time setting the crimp die. It was very difficult to see if it was doing anything at all. We gave it our best effort and put what we think was a crimp on the 100 rounds that we loaded. Honestly I'm not sure that we did anything. Today my buddies tested out the ammo and it worked fine. So, my question. Is it necessary to crimp 223? How do you know when you've crimped it enough? I'm a rifle reloading virgin, so any info would be great.