I'm not limited by the jacket length: the CS die set can not safely seat the core if the jacket-core weight is slightly more than 220 grains. That is to say, there's less than .3" of space over the core that the external seating punch can fill before swagging pressure comes to bare. Just goes to show that when you order dies, you have to let the maker know how heavy your bullets are to be. That way he can provide a 'short tail' CS punch and cut the PF cavity slightly deeper.