Did you recover the bullet? Measurements of the bullet would hint at the cartridge used, which would let us calculate how and where the round was fired.

There are certainly cartridges in production that carry dramatically more kinetic energy than the example I used, but the more powerful cartridges tend to be more rare.

Note that as velocity bleeds off the trajectory degrades faster and faster, resembling an upside down exponential curve. The angle of impact is much greater than the angle at which the round was fired; more so as distance increases.