Don't ask me man, I'm just telling you where to find them in the program. Taking a quick look at the book (p 342), that is what they are listed as. Maybe there is some real-life reason, since world-range weapons can only go to 50,000 km max, maybe real-world lasers are thought to have that as a maximum effective range as well? I'm just speculating here, I really don't know the reason.
Ok, I'm just taking a look at the Distances chart on p 41. It says that the next highest range category is 250,000 km, which it lists as having a light delay of 1 light-second. That means at that range lasers would not be instant-hit weapons and would at least require target leading, assuming the target was on a constant vector. So maybe that's why. Or maybe lasers can't be focused effectively at that range. Again, just speculating.
Ok, I'm just taking a look at the Distances chart on p 41. It says that the next highest range category is 250,000 km, which it lists as having a light delay of 1 light-second. That means at that range lasers would not be instant-hit weapons and would at least require target leading, assuming the target was on a constant vector. So maybe that's why. Or maybe lasers can't be focused effectively at that range. Again, just speculating.