Best method for determining yardages for Williams Precision

[PhillyB]

What is the best method for determining the distance for hash marks on the Williams Precision rear sight (shown below)?

I have built sight tapes for my bow using archers advantage and can do it the old fashion way of shooting 50, 100, 150, etc, then marking... but I am sure there is a better and cheaper way to get me close, then fine tune the yardages.

This is my first time into something like this, so all suggestions are welcome.

Thanks.