(adsbygoogle = window.adsbygoogle || []).push({}); Is Hardened like Stopping Power and increases the bullet damage?

No its just like FMJ or Deep Impact from CoD4 I think its a x1.25 increase to bullet penetration.

I believe it does. If you go to Private Match and edit the Perks, you can alter the damage output multiplier. If that's even there to begin with, there must be some sort of additional damage bonus.

Here's an example, I'm just using a random number for damage:

A gun does 10 damage.

Through a wall it will do 5.

With hardened it will still do 10.

Through a wall with hardened it will do 8.

The multiplier is how close the guns original damage stays through a wall.

It may seem that the gun is stronger when shooting multiple enemies because when shooting though one to another the "through a wall" effect will happen and will weaken them down more so it takes less to kill them after you kill the person in front.

No it only helps you shoot people through objects like Walls and that if it does it will only be like 1 bullet less to kill basicly nothing you'd notice and the pro versions just increases damage you do to vehicles like the helly and chopper gunner.

If you use on a sniper its the only way to get like double headshots..