I will discuss this hypothetically first.
You will need a Powerhead to kill a shark.
12 gauge is probably the easiest thing to use for availability of ammo.
Now the hard part why will you kill the shark in the first place?
A lot of divers here on this board encounter sharks regularly and the procedure they use is to leave the area, a short trip of 2km will be enough to lose the shark.
There have been a lot of discussions here recently about the killing of sharks and while I personally do not have a big problem with killing any fish(as long as you eat it), some people feel that killing sharks is not to be encouraged.
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