@Az, thanks for posting that, the reason why I went with the 21 Hexes = 1000m was because they'res a LOT of MW4 types around and if you suggest that a LRM should be 630m they'll squell ('cause it was 1000m in MW4!)

And TBH with 1.5-2K draw distances we're better using 45 or 50m as 1 Hex. Also I think the Devs did the same thing, because many weapons on that list are roughly equivalent to what they would be if a Hex was 47.6m(1000/21).
It's good however to see the exact CBT values for comparison as it makes the same point, and is easier to read than my table.
Here's some little tweaks I'd like to see that I think would help gameplay:
MRMs reduced 100m to 700m range.
SRMs (including IS StreakSRMs) increased by 50m to 400m,
Clan Streaks increased to 500m.
PPC increased 150m to 850m
ERPPC & Clan ERPPC increased a 100m to 1000m (the LRM boats nemesis, as it should be)
Class 5 Autocannons adding 200m to 1000m (all except the old AC5 which should gain 50m to 850m)
Class 10 Autocannons increasing range to 800m (except the old AC10 to range 700m)
Class 20 Autocannons new range of 550m (old AC20 range to 450m).
RAC5s increased 200m to 700m (making it a medium range weapon as it should be)
As you'll see the changes are only tweeks to place the weapons in their intended range brackets relative to each other for better Simulation, mostly it's a tweek of 100m more or less, but it would be great to try out; of all the tweeks I would like to see I think the Class 5,10 & 20 AC changes are the most needed, right now the CheapHammer and the UAC10 MadCat feel more like short range machines than medium range specialists, and anything with a UAC20 feels like short range is really Extreme-CloseUp.
Off Topic: Clan LRMs fired at point blank ranges are part of the design strategy of the Cougar, Mad Dog and Timber Wolf so I really think we miss the soul of these machines if we insist on a 300m minimum range. I'd like to see Clan LRMs not arcing if locked on target & under 400m, instead I'd like to see a Lock + <400m meaning that the Clan LRMs switch to firing like MRMs (spread out damage instead of an accurate concentrated stream) and I'd like to see an increase the cost of the Clan LRM by 30-50% to compensate for no minimum range.
LRM lock time reduced slightly (10%) to compensate for the fact that so many weapons can now touch the LRM boats.
EDIT: Forgot RACs!