[uHuge]

First impression to me was that it is some sort of modern kinetic projectile[0] from aircraft weapons' testing. I've read US army used something of that shape in recent conflicts, but probably of smaller size.

[0] https://en.wikipedia.org/wiki/Lazy_Dog_(bomb)

[GekkePrutser]

It probably wouldn't be in such great shape after impacting at high speed though.

[aeoleonn]

This is a really good point. I wonder if it could be some sort of new-fangled rail-gun projectile.