Or, the previous rifle the brass came from had a sloppy chamber, which increased the brass right at the base, where it isn't being sized.
How firmly is the die contacting the shellholder? Could also be the previous gun had a slightly longer headspace.
I'd check brass length first, then headspace/die setting, and then finally the base diameter. It has to be one of those.
Small base dies should not be needed if you have a bolt action with a standard chamber, which is what the Axis is.
The die is touching the shell holder
