None of our weapons have infinite range.  In fact the fastest moving shots (the blaster bolts from the space fighters) have a max range of only 3k.  Interestingly that's also the maximum viewing distance BF2/2142 can support.  After that though they disappear.

Every other blaster in-game has a far shorter "range", though that word in itself is just an amalgam of two more important variables: speed and timeToLive.  The speed determines how far a projectile goes per second and the TTL tells it how long it stays in-game.  We set a decent TTL on everything so the server doesn't fill up with an endless amount of projectiles (should they all be fired into the air) as that would lag the thing up to no end.  I think 2 is the average TTL we use.  The average speed is between 250 and 1000.

Most of our projectiles will span out to about 800 metres, which is the visual range of our ground maps.  Even if the visual range is longer though, without the aid of a targetter it's impossible to see anything as more than 1 or 2 pixels past that distance.  And even if you can see them, there's another setting that makes shooting at distant targets kinda pointless: damageloss over distance.  Our projectiles (like most projectiles) lose their damaging ability over distance. So the further away you are when you shoot someone/something, the less damage you're going to do.

And to respond to the initial poster, every one of our weapons is either a blaster or missile launching device.  This means that every projectile that is fired is visible in some form or another.  Firing your weapon at extreme range usually carries a big risk because of that, as now you are painting a bright red or green line across the map that leads directly back to you. In space combat especially you can see a line of blaster fire against a black background easier than a small fighter way off in the distance.

Anyway.  In conclusion, not even taking into account the inaccuracy inherent in the controls (none in the game have the ability to target to within decimal points of 1 degree) and the deviation in the weapons themselves, it becomes apparent that not only is it near impossible to hit people at extreme range, you'd do little damage if you somehow did manage to hit them, and it'd only serve to put you in greater danger rather than killing the enemy to do so.

I hope that answers your question

Fear the Woodzilla