Don't be quick to vendor your 1st orange rifle. That ***** will be your best looking weapon for many levels to come, just keep it up to date with mods.
No, I'm pretty sure the min to max damage range does not scale with mods (sadly). Update your rife at every possible chance.
The level 48 rife from Voss is ok looking. But I do think the rifles srites so far that I have seen need way more love.