The only thing about "stopping power" that I will add is this: You cannot park someone permanently, in the very position where they stand or sit, unless you make a CNS or T-Zone hit. Period.
If you do make the CNS or T-Zone hit, they will never, ever move again.
If you can't make shots like that on a flat range, you'll never be able to make those shots (intentionally) under stress.
Even if you can make those shots on a flat range, you probably won't be able to (intentionally) make them under stress. You need to gain proficiency on the flat range, and hone your skills with stressors included into your training.
You might get lucky, though - even a blind monkey finds a banana once in awhile... <lmao>