I don't believe the second crimp is needed, but the crimp at the mouth is needed if you plan on shooting it in anything other than a single shot, or if you feed one at a time in a lever action.
If you load up a bunch in the 1895 magazine, as I do, the crimp on the mouth will keep bullets from getting seated further into the cases, in the magazine, resulting from recoil.
I just use the Leed Factory crimp die for mine.