Bullets don’t travel flat, even for one yard. As soon as a bullet leaves the barrel it starts to drop at an accelerating rate of about 32 feet per second per second.
After one second in flight a bullet will strike 32 feet below bore-line of a horizontal rifle. A 100-grain .25-06 bullet launched at 3,150 fps reaches a coyote 250 yards away in a quarter-second. During that eye-blink the bullet drops 3 feet, not 8 feet, because it’s gaining speed as it plummets.
Were that speeding bullet to stay aloft, during the last quarter-second it would fall several times as far as in the first.
A slower bullet drops the same distance during the same period. It just doesn’t cover as much ground.