The Hardin crimp was to alleviate the problem of a hole in the center of the crimp, no matter what the cause. Yes it was a OS card to cover the hole. I never tried to trim a 1/4" off a shell then use my normal date to see what happens. When I trim a 1/4" I'm roll crimping. Why would you trim a 1/4" and fold crimp ? If it's for 2 1/2" shells with a fold crimp, then adjust your load stack height with a different plastic wad of fiber cards. Maybe your idea will work. Good luck and let us know.