[Radek]

Yes, the damage caused by ranged weapons is often evaluated badly. Nevertheless, I think that the value of the Tansheron's Bow or the Sling of Everard is based on the rank of the weapon, not on the damage caused by the weapon. The bow is "+3". If it causes only 1d6 damage then so be it. Similarly, the sling is "+5". This does not mean that the damage of the ranged weapons should not be fixed.