Why dont you make the tip (meplat) smaller, so the bullet would have a sharper point?
The answer to this one contains two parts. The first has to do with length of the bullet and the weight distribution over the length of the bullet. The second has to do with the velocities at which the bullet will open. When the tip of the bullet is brought to a small point, becoming a spitzer, rather than a semi-spitzer, the bullet would become longer, for the same weight. The pointed nose of the bullet would also mean a lesser amount of the mass of the bullet will be outside the case, obviously necessitating that a greater amount of the mass be inside the case, taking up powder space.
