Prone aiming produces almost no gun sway for any weapon. This makes scoped rifles very overpowered and too easy to aim at long distances. This, in turn, makes scoped weapons very unbalanced against non-scoped weapons and encourages camping. It detracts from realism and fun.
*Prone position should have higher gun sway and reduced accuracy for all weapons, but still more accurate than crouched shooting.
*Scoped weapons should have a slightly higher rate of sway due to added weight on the weapon.
Link to forum discussion topic:
http://forums.bistudio.com/newthread.php?do=newthread&f=160