I don't load the 50 AE, but if it's a rimless cartridge like 9mm, 40 cal., 45 acp, ect. than all you need for crimp is just enough to remove any belling that was used during seating, no more than that. It's for this very reason that I even hate using the word crimp when referring to rimless cartridges, because crimping is not what one should be doing. These type cases head space off the mouth, do not attain any neck tension at all from the crimp, and more crimp than is necessary to bring the mouth back to resized spec only decreases neck tension.
I don't use any mouth bell or crimp when loading rimless cartridges, never have. But I also only load with jacketed bullets, so I can get away with it by chamfering the inside of the mouth evenly to assure proper allignment and no bullet shaving during seating.
GS