Mark, I thought the reason for the spacers was to bring the payload up for a 6-8 crimp in the 3 1/2" hull. Without them being there, the load would be 4-6 x .135 lower. If the hull were 2 7/8" there would be no need to add the spacers. Roll crimping you might have to add one or two, plus your overshot card/s.

David


David