Hey yall. What's the deal about 5.7x28mm ammo? The FN 57 and P90 shoot it. I was looking at ballistics data and was surprised. Sure the velocity is awesome, 1800fps. But, the energy was only around 350ft/lbs. Now I understand that figures aren't everything, but still, the round just seems like it would punch right through you without transferring much energy at all.