Thanks Utah, have used a board 'function' for that!
And for the guys using a drill bushing, it is a relatively cheap option.
I made a de rim die like this with changeable bushings (I make the bushings too)
It has one real nice side effect, hardening and honing a bushing is a sight easier than a complete die!!! and if you make a boo boo it does not make you cry!
@rmatchell - you can make the dies for next to nothing but I would advise that you at least 'scrounge' some quality heat treatable steel for your project. Your biggest investment by far is the time you throw at it!