This talk of lower recoil from a type of hull, leads me to believe that there is a difference in the peak pressures of the different cartridges. I'm not disputing any difference due to headspace, just that I am not a believer in the mystique of paper hulls producing lower recoil without producing lower pressure. I'm a follower of engineering data, not ja-ja beads or voodoo. If paper produces less recoil for the same powder pushing the same load out of the same gun the same velocity, it's because of a difference in the pressure curve being spread out and lower peak pressure.