Depending on how much money you want to waste. If you have unlimited fuinds go ahead and join Gilberts. You have to buy their ammo which will kill you. I rather just drive another 15 minuted and go to nrA range in fairfax. Its a nice range with a friendly staff
I would recommend going down to Cresap rifle club (out door) for $3 for admission and target. And they allow you to bring your own ammo. Its far but in the end its worth it.
http://www.cresaprifleclub.com/facilities.php