How far will a bullet travel?
The distance a bullet will travel is dependent upon many factors. The three greatest factors in determining the distance a bullet will travel are caliber of the bullet, the weight of the bullet, and the trajectory used when firing the weapon. Many ammunition manufacturers provide "maximum" distances on the individual packages of each type of bullet.
Effectively, and expecting to be able to hit your target, you'd be looking at about 25 metres, under ideal circumstances. The bullet may travel significantly further, but most of your 6.35mm pistols are "pocket pistol" designs, intended only for the closest of ranges. As far as how far the bullet will travel, it may travel up to 500 metres or more, under the right circumstances.