depends on what type of bullet your useing. If useing a jacketed slug you may not have to bell the case at all or very little, in fact in some situations useing the neck tension of a sized case to hold the bullet instead of crimping can increase accuracy ( please consult your loading manual as some powders will not burn correctly if the bullet is not crimped, also bullets can "jump" foreward if in a high recoil situation when not crimped). Belling is mostly used when useing lead bullets to keep from shaveing lead off the slug when seating the bullet. I bell the case mouths just enough to get the bullet started in the case, also you want to keep from belling to deep in the case as this could cause the bullet to be slightly canted in extreme situations. You just have to keep adjusting the die untill you find the sweet spot. If your haveing problems seating your jacketed bullets mic the inside diameter of your sized cases to be sure they are not undersize ( again check your manual to determine the specs), also mic the bullets to be sure they are the size they are advertised to be. Also be sure to debur the case mouth. Hope this helps, good luck!
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