I've found the plastic start crimp works just fine. The short kit is nothing other than a spacer to make up for the shorter shell. A piece of wood would work. Where it's needed is in the final crimp - it makes the shell go up in the final crimp the proper distance so the shell isn't " belled out " at the end. If any of you want load data go to our reloading forum. Short 10 loads are the same for longer shells but adjustments will have to be made with the wad so everything will fit. Many times fiber wads will have to be used and they can be bought from
www.circlefly.com . Graig has recommended what size wads to use. For nitro I use 18grs of 700X and the Remington SP-10 wad [ with a 16ga wad inside for filler] ; and with BP, 85grs of 3F, fiber wads, and 1oz of shot. Good luck - Paul