The type and caliber of bullet is what matters most, not the velocity. FMJ bullets, no matter the caliber, are designed to penetrate hard surfaces. When it comes to soft tissue, they go right through potentially doing less damage(depending on what is hit obviously). Hollow points expand on contact, making them less effective against metal objects but much more effective against soft tissue. You would stand a much better chance of survival being hit by a .223 FMJ fired from an AR-15 from 20 yards than by a .45 hollow point fired from a pistol at the same distance.
Basically, you have no idea what you are talking about. I know more about guns and ballistics that you will ever know.