I was loading a small batch of .45 tonight, and then random sampled a few to gauge. This one wouldn't quite go in. On closer inspection, I noticed what appears to be a crack in the base of the brass. I wonder what would have happened had it chambered and been fired from my 21? I'm not going to find out. It's in my impact puller and will be taken apart tomorrow. Sorry about the poor iphone pic...I didn't feel like breaking out the real camera.