Look, Englismen and us are simple folk, so I would not expect to find info you seek in our language. Most of the books on hunting arms and such are written at 8th+/- grade level while what you seek would require understanding of the language at university level. Have you checked with the Germans? I heard they luv stuff like probable change in Vo (m/s) vs. "springiness" of shot cup, length of forcing cone, hardness of shot,.......