An art foundation has put an ammo test on display in the Presidio of San Francisco. According to the San Francisco Chronicle, the display is the result of an AK47 bullet smashing into an M16 bullet. So probably 7.62x39mm vs 5.56x45mm. I am curious about the origins of this ammo test. Were the rifles fired simultaneously or was one shot after the other? From the looks of the clear gelatin it looks like the bullets collided in the middle. If one rifle was fired then the other, then the first bullet would have travelled further into the ballistics gelatin before the other bullet collided into it. I wonder how many times they tried this before getting it right?