im trying to determine at what point energy is more critical than mass. for example, shopping corbon's lineup they offer (in .45):
165gr - 1250fps/573ftlbs
185gr - 1150fps/543ftlbs
200 gr- 1050fps/490ftlbs
230 gr- 950fps/461ftlbs
as the bullet weight decreases, the energy increases but at what point does the importance of energy surpass the importance of mass? what makes for a "better" defensive round?