Originally Posted by hiwall
7000 grains in a pound. Bullet weight and powder weight are always in grains.
Take a 9 mm with a 115 grain bullet or a 147 grain bullet. Usually the lighter bullet would be faster(higher velocity) and have less recoil and less muzzle jump. There are advantages to both heavy and light bullets.
That begs the next question. In your 9mm example is their the same amount of gun powder in the 115gr round as the 147gr round? If so, I assume there is a difference in the velocity of the round. What about the energy of the round, is it the same for both as energy = mass X velocity?