If you check things over after the bullet is seated and they're ok up to that point, then check them after crimping. If they're "wrinkled", then I think you've isolated the problem to the crimp stage. If the problem occurs at the seating station, then you probably need to expand the case mouth more. Not an uncommon problem to see bullets with beveled bases seat ok, then have those flat based bullets ruin the case--usually at the mouth. The latter simply would require more expanding.
However, since your problem seems to occur at about where the bottom of the bullet would be, (middle of the case?), then that adds a bit of mystery. Unless the case is buckling--but when? A bulge could occur when the bullet is seated down to the thicker portion of the tapered case where the diameter of the case is smaller than that of the bullet. Make sure you check the COL from the Manual. Are you sure the top cannalure is the right one to crimp? Your bullet is seated deeper that way. Be careful. If the bullet is seated out more by using the other cannalure, will it still fit inside the cylinder ok?
Since we're curious now, be sure to let us know what you come up with.
