I used to work for the NRA, and I use their range, but it's only 100 yds. However, they allow anything up to a .470 Weatherby.
Hey, just need to clear something up. The NRA range is 50 yards and allows up to the .460 Wby. It's a really nice place to shoot, but 50 yards leaves a bit to be desired. You also can't use anything but slugs in your shotgun, which annoys me a bit.
When I want to do some rifle shooting, I go to the Hap Baker Range in Westminster, MD. It's outdoors back behind the county landfill (suprisingly little smell out there) with 25/50/100/200 yard targets. It's a couple hours from NoVA, but I usually go anyway (my family still lives up there) to hang out with my cousin/hunting partner/shooting buddy.