Make a search and try to find D'Addario's string tension file (13940 pdf or something like that). It has different tensions for strings, and how the tension changes, if you detune. If you learn to read that, you are able to make even tension sets or special tunings with similar tension compared to a, say .45 set.
BEAD is pretty common, just like CGDA. You can tune your bass to fifts, if you like. But that file will help you in your trials.