Creative Speculation

What...like 3 feet....now we should be able to figure just when the bullet struck with simple math....the bullet was say traveling at 2500 fps and imparts it's energy to the matter and that matter travels 3 feet...how long does that take....and that is the moment of impact....
Care to do that math?...I don't need to because I know that it will be a very small number sense 1/30 of a second the bullet travels about 80 feet...so the ejected material would be far faster than you think.
Look at a slow mo of a bullet striking an object and you will see the cloud of material when the bullet hits jumps out even before the bullet has past into the target.

But it is amazing how you can say that it is proven because you must be right that the bullet exited the head in 313....You use your own conclusion as evidence that you are right...I say 313 shows the bullet entering the head from the front....and that explains the backward movement....which you just ignore.