resizing problem

Going to try some case lube, and keep an eye on things
The dies are RCBS carbide
the spring plunger seems to be working properly
 
I suspect you being a guy that wants to hurry up and get er done. I'm not making fun of you but this is what I am thinking.

Take and inspect the remainder of your cases that you have left. Clean them and try each one in your pistol chamber to see if they fit all the way in.

carefully look at the head stamp and sort accordingly.

clean and re inspect the die setting.

Try putting a small amount of break-free on a rag and wipe your fingers on it for the small amount of lube to be put on the cases before sizing.

don't allow your self to be disturbed wile you are loading.

Take your time and carefully think it out and watch what you are doing step by step.

I think if you do the above you will see the problem.

I thought I was wrong one time but I was mistaken. :D Ha ha

Good Luck
 
You are resizing some brass that was fired in a larger chamber, and the brass swelled at the base. The die displaces brass down to the limit of it's resizing capability. This leaves a the "ring" at base.

Risky business picking up .40 brass off the floor, and not knowing what it was fired in, or how many times. Especially depending on what pistol you are reloading for, and at what pressure?

You may want to consider sorting your brass, and pitching any that look like excessive swelling on one side of the base.
 
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