I've been reloading for about 6 months now. I've done alot of research and note taking long before I loaded my first round. I keep seeing the term "smiley" in regards to reloading. What exactly is a "smiley" and what causes it? I have been assuming it was the dent in the side of a case caused from ejection. If this is the so called "smiley", how is it bad, and how does one keep it from occuring when reloading?