If they where straight couldn't you just trim them down to the right size, resize them, and trim one more time?

pdawg--If you wanted a shorter rimmed case necked down,
yes you could cut our cases off and size to what you want.
Now if you wanted rimless, you could just use BMG case
to start with, cut off and shortened, and sized.Or the
BMG spotter case already shortened and just resize down
to what you want.Ed.