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It won't make the gun more lethal, all the real world shootings say that.
If you like it for some reason any 147 SD ammo works as does the 124s.
It will take anywhere from 1 shot (well thats as few as you can get) up to 15 or more to kill someone with any of it.
By the way, thats true of all pistols up through 44 magnum.
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