In addition to the solution johndallman posted, which will work with a specific weapon, there's a couple of others that will apply more generally. First, you could see if your GM will allow a version of the Zen Archery skill that works with the weapons you want. Gun-Fu (p. 24) already endorses this, as "Zen Marksmanship" for light firearms and laser weapons, but you might have to argue more strenuously for Zen Rocketry, if you want to cover RPG launchers. :-)
Second, there's the Imbuements system, as presented in Power-Ups 1: Imbuements. There's not currently an Imbuement skill to reduce range penalties (the nearest one is Far Shot, which increases 1/2 D and Max ranges, but not the range
penalties you suffer. Offhand, I'd build a "True Shot" imbuement as follows:
True Shot
Ranged; DX/Very Hard
Default: Specialty for related weapon at same penalty as weapon default.
Prerequisite: Imbue 3.
True Shot allows effective attacks at much further ranges, either by telekinetically controlling the projectile, or using precognition to fire at the perfect time to avoid the common causes of missed attacks. An unmodified skill roll allows you to divide penalties for range and speed by 2 before applying them to your attack roll. Note that your normal 1/2 D and Max ranges still apply, however!
Modifiers: -1 to divide penalties by 3, -2 to divide them by 5, -3 to divide by 7, or -4 to divide by 10; For -5, you may use the Long-Distance Modifiers (p. B241)
instead of normal range and speed penalties (don't divide these), while for -10, you have
no range penalties at all.