Let me revise my first comment.
Shark
Striking Strength: Wall Class (It has a bite force of 6,000 N, stronger than any other extant shark)
Durability: Wall level (Able to survive bites from other sharks and other deadly fish)
This seems to suggest it's durability is at least = to the force similar sharks output. However, "surviving bites" means that they in fact get bitten, which does not in the slightest bit represent what durability actually is. Durability is a shark biting you and breaking all its teeth off.
Now force = opposite force, but the spread of energy over the surface area that the shark's bite force affects < the incredibly small surface area of the head of a bullet. Pretty much apply the inverse square law here.
Desert Eagle
"Fired from a standard six-inch Desert Eagle barrel, Speer's 300-grain load produces a muzzle velocity of over 1,500 ft/s, giving a muzzle energy of over 1,500 ftÔïàlb (2,000 J)."
1500 ft/lb =~ 6672 newtons which would smoke the shark, given it's not underwater.
Besides, our AP system is measured in energy, not force, so idk how well that shark sizes up in terms of energy.