RE: Speed is all you need! (?)
For what it' s worth, I never said that speed isn' t important because it is half of a very important and potent combination. Coupled with Mass and in the right combination with your set up you WILL get penetration due to the combination of the two.
Plug these equations into your calculator according to this basic formula
Mass (Velocity X Velocity / 450240):
Equation 1. 0 gr (342 X 342 fps / 450240) [Speed without Mass]
Equation 2. 315 gr (0 X 0 fps / 450240) [Mass without Speed]
With either of these setups, can you tell me how likely you would get measurable penetration?