Quoth Bass Man:
... Which crimp groove do I use. Does the Hornady manual and other bullet manufacturers manuals give that kind of info ...
The Hornady handbook doesn't say which groove to use. It does mention a Case Trim Length of 1.280" (Max case len: 1.290") and a C.O.L. of 1.590" ...
So I'm guessing the groove that's ~0.305" down from the tip.