Well, the Devs (as of Q&A 05) have stated that the TT long range would represent the maximum effective range, with most weapons able to travel beyond that point, but lose effectiveness.
(Devs: has that changed?

)
Also, in terms of range across weapons, the LRMs (both IS and Clan, by the way) having an
effective range of "only" ~640 meters isn't that bad considering:
- The effective range of a Large Laser would be ~450 meters.
- The effective range of an ER Large Laser would be ~570 meters.
- The effective range of a PPC would be ~540 meters.
- The effective range of an ER PPC would be ~690 meters.
- The effective range of an AC-2 would be ~720 meters.
- The effective range of an AC-5 would be ~540 meters.
- The effective range of an LB-X AC-10 would be ~540 meters.
- The effective range of an Ultra AC-5 would be ~600 meters.
- The effective range of a Gauss Rifle would be ~660 meters.
So, the only weapons that would normally out-range LRMs would be the lightest of ACs, the ER-PPC, and the Gauss Rifle.
And the
"Extended LRMs" ("ELRMs") developed by the Federated Commonwealth in 3054, with their maximum effective range of 1140 meters...
Edited by Strum Wealh, 08 May 2012 - 02:29 PM.