Weapon Range Variable

It's generally in the minimum and maximum damage variables. As in, if the range is less than X, do Y damage, otherwise do none.

I think the way the min and max damage lines are writen is that if you get to a certain distance the damage is reduced by 100000 or some such huge number.

SEV, more than a feeling.

Yep, pretty much. There is no 'range' variable persay.
It's a derevation of the damage variable instead. Probably cuts it at the point damage = 0, though I wonder if you could make a weapon with a minimum range....., 0 0 0 10 20 30 20 10 0..... be interesting and make strategy more entertaining at that point.

Point defense weapons have fixed range, it does not change with levels. And yes, if it's less than 200, it will fire (assuming the target is valid).