I can see Conder101's implication...that a crack in the die can, or should be able to, go to the outer circumference of the die. This would mean that it would include the shoulder on the die which is responsible for the inside portion of the rim. (I am not completely comfortable with my understanding of the morphology of a die, so I may need correcting here.) This would mean that a crack should be able to show at least to the approximate center of the rim (or that portion of the rim which is not attributable to the portion of the rim formed by the upsetting process.
Comments?