Virtual bullet doesn't line up with real bullets

He means something like:

Point2D.Double myNextLocation = project(myLocation,getVelocity(),getHeadingRadians());
Point2D.Double enemyNextLocation = project(enemyLocation,e.getVelocity(),e.getHeadingRadians());
double nextAbsBearing = absoluteBearing(myNextLocation,enemyNextLocation);

I've tried this, and using it to predict the enemy location didn't help me, although it did help for my own location. I think it depends on the way you define wave hits and starting locations in your gun. In DrussGT I wait until my gun-turn remaining at the beginning of the tick is 0, then fire. I put my bullet on the wave from last tick. As long as you make the same assumptions everywhere it should be ok.