Well people have been killed by bullets fired a mile a way. Bad luck is bad luck. At 5 feet above the ground, a 9mm @ 1200fps is hitting the dirt before it gets 250yds. Elevate the muzzle at all, even a slight amount, & the bullet is going to travel a lot further. Shot @ about 45deg angle, it will travel almost a mile.
"Given adequate penetration, a larger diameter bullet will have an edge in wounding effectiveness. It will damage a blood vessel the smaller projectile barely misses. The larger permanent cavity may lead to faster blood loss. Although such an edge clearly exists, its significance cannot be quantified".