I was trying to make an assault rifle,but how do I make the bullets hit harder?I tried messing with sharpness and mass but sharpness did not affect the force and mass just made the recoil terrible.....and the MaxVelocity thing only seemed to make the bullets move faster?

Mass, Sharpness, Velocity that should have worked....

You can also increase projectile count or use Lua to do more damage

Can you elaborate? I'm curious as to how this is possible.

There are lots of ways to do it. One is to cast an Obstacleray in front of your projectile and then do damage to whatever is in front. Or you could do damage to anything within a certain radius of your projectile.