So I bought some Montana Gold 55gr FMJBT's and have been in the process of getting them loaded up. Not sure if my issue a brass or bullet or perhaps my seater die isn't adjusted properly. All I know is that I loaded up a 1000 Hornady bullets without a single problem. The only thing that has changed is the bullet and I have adjusted my seater die to OAL is 2.245. All of my brass has been passed through a Wilson gauge and trimmed. I adjusted my seater die hoping to be able to crimp to the cannelure. After reading some of the recent threads about .223/5.56 reloading I decided to not worry about crimping for the time being. As you can see in this photo the 3 rounds to the left have "rolled" a bit just under the shoulder. I can actually feel it happen as I seat the bullet. It doesn't happen everytime but frequent enough to be darned irritating. The round on the right is a Hornady bullet and as mentioned one of a thousand where I didn't have a single issue. This photo shows the Hornady crimped round on the right and the problem round on the left. Thinking I had a crimp issue I removed the crimp die and yet this "rolling" still occurs. There are also some weird marks near the case mouth. So what in the heck is going on?????