I've been to Clark Bros. about a dozen times in the last 2 years, bought some powder and then I can shoot my reloads I load from it there for free range time, and it's been a pretty safe place when I'm there. I don't go when I know it'll be crowded, so I can't speak about what it's like with a full house. But, say it's half full, from my experience the RSO's have been very watchful. I've seen them use the PA system to publicly humiliate people they've warned once and didn't listen, couple were 'asked' to leave.
It's also a rare thing...an outdoor range in Northern Virginia that's open to the public. It's best for rifles, the pistol range is 25' max.
"And remember, Abraham Lincoln didn't die in vain, he died in Washington D.C." - Firesign Theatre