As the title says, I screwed up and don't know what I did wrong. I loaded fifteen 30-06 rounds for my uncle. The brass came from his son in law and they are all once fired.

I loaded up fifteen 270 rounds for myself. All of the rounds had different powder charges as my reloading manual says to. All of my uncles rounds did fine and we found an acceptable recipe. None of my 270 rounds would chamber in my .270.

What the he//!!!!!! All of my .270 rounds had bouldges in the neck area of the cartridges. Please, what did I do wrong. I can't get a decent photo of my bullets.