If it doesn’t hit any vital organs, you won’t die instantly. But there’s now a big hole in you, so unless it’s treated, within a few minutes you might die of blood loss.
You could also pass out, rather than die right away, either due to the shock, the damage, or the blood loss. Obviously then it’s harder to get help.
And depending on the bullet, it could shake you up and disrupt stuff in you just from the force of the impact.
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