Change shooting accuracy on entities

The problem you're running into is that entities have inaccuracy coded in by default, so they aren't totally overpowered. This is really apparent when you try to get an entity to shoot at something more than a dozen or so blocks away, it's almost comedicly bad at aiming.

One thing you could try is using procedures to shoot projectiles from the entity's location, with the entity as the owner. The tricky part is then doing the math to get the entity to actually aim at a location, which is made even more complicated by the fact that most projectiles are affected by gravity. Essentially, you'd have to do an arc-projectile calculation, which I only vaguely remember from AP Physics, and which I haven't been able to get working no matter how much I beat my head against it. 

You could try making your sharpshooter's projectiles unaffected by gravity, in which case you might be able to get away with forcing the entity to look at the nearest player, and then firing the projectile with its velocity set to the x/y/z look angle vectors of the sharp shooter. (You can then multiply each of the look angle vectors by the same amount to change the speed of the projectile.) I'm pretty sure this would work, but entity behavior is always weird to work with, so take it with a grain of salt.