You shouldn't let yourself be too limited by your map scale, though. The fact is, a lot of common weapons (rifles, whether assault or sniper) can shoot quite a bit farther than your maps might allow. You can deal with this by having some combats take place at a different map scale (5 or even 10 meters per square in extreme cases), or by taking a "mind's eye theater" approach to long range conflicts. Just don't let your maps steal away the advantages of long-range weapons (as well as spells, since all they require is line of sight).