I ran into a similar quandary when revising my 1st ed weapon damages and ranges. I solved it by calculating a new stat maximum range, to get maximum range take the damage multiply by 2 and add it to 8 (extreme range). This is the new maximum range for that particular round. so for example a 5.56N has a max range of 12x the rng stat and a 7.62N has 16x the rng.
Think of the listed range as how flat a round shoots when fired, the higher the velocity the flatter assuming the gravity is constant (it is on earth). The problem with this is that the way extreme range is determined a light high velocity bullet like the .17 Remington will have a further range than .50 BMG.
The reality however is that a lighter bullet will loose it's velocity sooner and with that accuracy. This is why all the long range sniper shots are accomplished with rounds like the .338 lapua and .50 BMG. Using the damage rating of the round accounts for the mass of the bullet.
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