So I'm getting around to loading 223 for my new AR build and have done plenty of research on whether or not to crimp and have found everybody likes doing their own thing. There does not seem to be a definitive answer. I decided to try no crimp with my first rounds loaded. I used hornady 55gr FMJBT and NEW Remington brass. I found that after chambering a round the OAL will grow a small amount, maybe .002 inches each time (letting the bolt slam home). Is this normal? Do any of you guys that do not crimp 223 experience this as well? Should I start crimping to prevent it from happening? Wanna kill these ads? We can help!