According to a report submitted to US Senate by their National Air and Space Intelligence Center (NASIC) , the actual range of Pakistan's Shaheen-3 missile is 5000 Km. The organization has access to long range radars and plethora of spy satellites with the added bonus of having experience of building missiles since 1950s,so their data and statement is as credible as it gets. Pakistan is deliberately firing the missile at a lower range of 2750 Kilometres. The reason of keeping the range lower is to have a higher speed. The fuel which could carry the missile to greater distance, is being used in giving the missile a higher velocity, specially when it re-enters the atmosphere.