Edited sentence: In such situations a 15-shot 10mm (Glock) with its 100 yard guaranteed accuracy, low perceived recoil, flat trajectory, high energy, penetration, speed of fire and low muzzle rise give the police officer, federal agent or citizen preserving their life a much better chance of survival.It is of course possible that a self defense situation could arise at ranges up to 100 yards.Policemen have been killed by rifle and shotgun armed criminals at much greater than 7 yards