The best replacement for stopping power is double tap.

The best alternatives to stopping power are rated as following:
★★★★★  double tap
★★★★  cold blooded
★★★★  juggernaut
★★★  fmj
★★  hardline
★★  penetration
★  shot placement
★  lightweight
★  danger close
★  cold blooded mw2
★  deep impact
★  muzzle energy
  45
  9mm
  40
  uav jammer
  40 cal

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Speaking about stopping power, one probably shouldn't forget about silencer.

Other search terms related to stopping power and their ratings are:
★★★★★ silencer
★★★★ fmj
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Google Trends

Scale is based on the average worldwide traffic of stopping power in all years. Click on graph for more.
stopping power
double tap
cold blooded