Sood, I have to somewhat disagree with you. My setup for mad kills is this:
MP40 w/h AP Sight
C4
Stopping Power
Second Chance
I have disbanded Steady Aim due to the fact that with AP Sight, there is no need for Steady Aim -- almost all of my hits are dead accurate. Anyhow, with that out of the way, you will normally die by these reasons:
- You run out of ammo in mid-fight
- You get killed in the back
- You are reloading
Juggernaut, although helpful, is really only helpful to new players of the game, where they can take hits and not die as often (as its intent). However, even with Juggernaut, you can still die by the reasons listed above.
Stopping Power is a great perk, due to the fact that you can kill someone much faster, especially if you can aim very well. It's hard for me to explain, but I feel that Juggernaut just plain sucks ass. I barely use it, and if I feel like a supreme dick, will more than likely zigzag run and knife the person if they're a few feet in front of me -- when I know they have Juggernaut on. It's quite funny how if you zigzag run, I'd say 30% of the people won't be able to keep up with you with their sight and will be vulnerable to the knife.
Stopping Power is for the aggressive player, whilst Juggernaut is obviously for the defensive. Even with Juggernaut on, you really only last like 1-2 more seconds.
Also, if you use this setup:
Shotgun w/h Bayonet
Bomb Squad
Juggernaut
Extreme Conditioning
on a game such as FFA or something, it grants you mad kills. I'd suggest the Bayonet setup to anyone that gets bored, because it's pretty funny hearing people's reactions, like one time, I did a jumping Bayonet kill and the kid was like "what the

!?". Haven't played COD:WaW in awhile since I finally beat Veteran, so not sure if people be dicks and run around using Bayonet. I want to start jumping in on the daily CAG gaming night, just so I have a reason to play online and see where I stand rankwise on CAG.