I was looking for a depth chart for magnum dipsy's when I came across this. It calculates depth by speed and distance out, whether your running braid, and has depths for lead and the other divers beside dipsy's. Just click on the diver you're using. I looked into it when I had the dipsy's out in 100' and they were bottoming. Come to find out I've been running way deep thinking it's 3-1. Here's the site.
http://dipsytroller.com/