I have a buddy who has called in numerous big blacktail bucks using fawn in distress calls. He uses an old Weems Wild Call.
During the rut you can get doe's to come right in, and they usually have a buck in tow when they arrive.
Last December a friend and I were setup calling lions using a FoxPro electronic caller. When he ran the fawn in distress call, 5 doe's and fawns came running in, followed closely by a mature 4x4 buck. The dominant doe walked to within a couple feet of the speaker with her ear back and hair on end, ready to kick the snot out of something.