Soooo, when reading the info in ballistics .set, namely this portion:

; distance/aim range --- damage scale
{curve "bullet"
{0.0 1.00}
{0.2 0.95}
{0.4 0.90}
{0.6 0.80}
{0.8 0.65}
{1.0 0.50}
{1.25 0.35}
{1.5 0.20}
{2.5 0.05}
{5.0 0.05}

It is correct that the 0.2 is not 20m but 20% of the weapon's max range? So, 100m range, 20%, is 20m? So, what purpose does 1.25, 1.5, 2.5 and 5 serve? Guns wont shoot that far. Is it for flyers that go beyond the range of the gun? But the only real portion of that range that matters is the 0.0 to 1.0? 0% range to 100% of gun range?