Very nice. I have gone the other way. I have used 270 to make 8mm mauser. I had to expand it in several passes to keep from splitting the cases. When I trimmed them to length I used a chamfer and deburing tool. In wasn't made to shorten much. So I put the brass in the chuck of my cordless drill. It took them down pretty quick. Mine looks like this.
Romans 1:16 I am not ashamed of the gospel, because it is the power of God for the salvation of everyone who believes: first for the Jew, then for the Gentile.