In rural areas the chance of hitting someone is remote because the number of people is low. In crowded cities, however, the probabilities rise dramatically and people get killed quite often by stray bullets. Most major cities have laws in place to try to keep people from shooting guns into the air in celebration. The bullets hit the ground at the same time provided that the gun and the ground are level. The reason they hit the ground at the same time is because gravity doesn't care that the bullet fired from the gun has horizontal velocity.
Gravity acts vertically.
Gravity accelerates both bullets vertically at exactly the same rate, so they both hit the ground at exactly the same time. Inc. All rights reserved.