If I shot a bullet that travels backwards in time, what would it be like?

Half-Life 3 gets released.

Maybe it would go back enough to be the bullet that killed Hitler? Who knows...

You might be able to do this. You need a strong gravitational field. Near it time will progress slower. The further you go the faster time is. The bullet you shoot from a higher altitude will effectively stay back in time as you travel faster through it.

You'll need to buy another bullet.

If you shot a bullet that travels backwards in time, then the bullet would not go off, as the hammer would not be triggered, and since it travels backwards in time, the initial travel outside of the barrel would never happen. If you go further than that, then the bullet would appear in your magazine/clip (i don't know), and if you go further than that, then the bullet would simply dissapear (depending on how much backwards will it travel, according to it's speed? to the relative distance?), and maybe appear in the manufacturer's workshop, or never at all.

You would be able to shape the future by shooting people that lived in the past and changed the world in their time. You could shape the current reality by shooting people that invented important items of our time for exemplo, or big conequerors. The possibilities are endless.

There's a couple of different ways i can see it happening, depending on which thought process you go through.

1. The bullet gets shot and as it goes back, it slowly disintegrates or reverts to it's original basic components. Rather boring outcome. It makes sense in a way but then again, it doesn't, since humans don't devolve when shown "time traveling".

2. You could trap yourself in a time loop. Bullets that fire but then have never been fired, both at the same time. Not sure how, better call the Doctor.

3. You could be the greatest assassin ever. Think Looper but with less bullshity "you have to kill yourself" and more kill others, who are bad, and gain money through illegal activities.

4. Still assuming that present action can go through the past and not "cease to exist" there's something else you could do. Depending on where you shoot it and when it's supposed to travel to, a ton of different events can occur. If shot between two buildings in a specific location somewhere in Colorado, USA at a height of 75 feet (23 meters), you could maybe land a headshot on a Brontosaurus (never do that, I love dinosaurs ._.').

I suppose one of the most difficult things would be understanding how bullets behave in time travel. Well... understanding time travel at all really. Do bullets go from the year 2014 straight to the year you want them to? Do they go back a second at a time, even if sped up? Is their movement conserved and therefore they keep flying while time goes back, potentially killing people that happen to be at a certain place and time, smack dab in the middle of the bullet's trajectory/time travel... thing.
This would be a fucking kick ass concept for a game xD Portal physics 2.0, not only space but time as well. Dang.

"People assume that time is a strict progression of cause to effect, but actually — from a non-linear, non-subjective viewpoint — it's more like a big ball of wibbly-wobbly... timey-wimey... stuff."
— The Tenth Doctor, Doctor Who, "Blink"

Maybe you revive someone instead of killing him.

you die

you eat shit

i feel like it would just me staying in place as it goes back in time but idk

we need a doctor and we can figure this out!

it would be like killing Hitler from the future preventing ww2 from ever happening

The most disappointing - but most likely thing would be that nothing would happen. The gun would fire, the bullet would go back in time and immediately unfire itself and remain in the gun.

Now lets assume for a second that you have some special gun that is created to be fired back in time. This would also mean that you either need some fancy way of targeting or a smart bullet. I figure that you would need to position yourself in the location/path of trajectory that you would have shot from to hit your target - since an automatic bullet is less likely.
The bullet would then as it got fired have to desintegrate into energy - since matter could not pass through time without causing many problems.

It would then materialize at the time and place of your choosing - probably scaring a lot of people. And if your calculations were correct it would proceed its trajectory and hit your intended target. Else it would hit whatever ends up being in its trajectory.

Which it is? Only time will tell.

You will be telefragged by yourself

It would decompose into Potassium Nitrate, Charcoal, and Sulfur.

Grunching, but something like this

At the point of impact is the big bang, so your choice to fire the bullet caused our universe to be created in the past, and in the future Douglas Adams will write a book where the first chapter starts with the line "The story so far: In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move." and he's writing about you.

Well, according to dc comics, you have to shoot a bullet that orbits the earth counterclockwise , if a decent speed is reached, after hundreds, thousand or even millions of orbits, you might be able to see the bullet before you load it on the gun.

The bullet probably has to be very small, but from a very resisting material. Also, it coudlnt use gunpowder, actually it needs a special kind of fuel to propel it our of the earth and to give it enough speed to start orbiting the whole planet in few seconds/minutes.

Technically you could do it inside the earth as well, but due to the amount of friction with air, and the very heavy combustible add on (it has to be plugged for the whole time inside earth.)

bullet will stay at the same place. as soon as you shoot it, it will travel back in time and return to its original position, with the shell.

**Conditions are that the bullet starts reverse time travel only after being shot, hence it will travel back in time only till the time it was shot.

if a bullet could be shot backwards in time, then it is important to know, how it will travel (instant or in a straigt way) and how long it will travel backwards / where it will end in time - and if the bullet stays at the same place.

If these parameters where given (let us say it travels in a straight way backwards and lets say for about 100 years and stays at the same place), I think the bullet will kill everyone who crosses the way.

(english is not my mother tongue so I hope grammar and / or word mistakes do not lead to suspend)

you could shoot the tardus

It would be like using a wormhole and it most certainly would leave some tachyon trail behing. Also it may kill someone ina different spacetime dimension.