I'm working on reloading some shells for one of my family members 243 win and I've ran into a snag. I reloaded up a batch of shells to go check at the range and i've ran into a bolt stick i have my coal set with a federal factory load that chambers fine in the gun. Upon inspection of the casing right at the base of the neck i noticed where it seems like it pushed it out it's like a small ring the whole way around the base of the neck like it bubbled out. I have my dies set properly and i've reloaded for many other calibers and never ran into this problem. Any ideas what it is or how to fix it?
I'm using rcbs group A Full Length resizing dies. The problem seems to be coming from the sizing die.