COD4 How much does stopping power really affect your dmg?

I could honestly not tell you exactly, but I know that your firing rate is multiplied by 2 on double tap for a standard ault, and it reduces on both sides, for instance a sniper will still only fire one bullet at a time, and a P90 will still only let off that amount of bullets. Your stopping power gives roughly a 25% increase on all guns no matter what, so generally it would be wasted on a sniper because if you are confident enough to be using a Druganov then it is probably because you are good with head shots (one shot kills etc) and is better suited to a gun like the AK, P90 because you are now firing a barrage of very effective bullets in the general direction of your target.