1. Go in Editor mode.
2. Spawn a IFV-6c Panther, with you as the gunner.
3. Press preview.
4. Switch the turret to grenade launching mode.
5. Set the range to max.
6. Press enter or which ever key you set to switch to outside view.
7. Look at the turret from the side and fire a few times; look out for the projectile vs turret angles.
8. Take note of the awkwardness.