Concealed means concealed. And if a gun range is not posted 30.06, I will carry concealed into it. If I plan to shoot my carry piece at the range, depending on the range and how picky they are about such things, I just go to the bathroom first, unholster, clear the weapon, place it in my range bag and then head to the firing line.
I rarely shoot ALL of my handguns at the same time anyway, so I usually try to at least have a loaded pocket gun on me even while at the range on the firing line and even when the range is "cold". Again, concealed is concealed. No one else needs to know about it. Having it concealed on a cold firing line at a range is no more dangerous to me or anyone else than having it concealed anywhere else in public.
And it will stay concealed unless something like THIS happens ...
http://www.msnbc.msn.com/id/30109090/" onclick="window.open(this.href);return false;
Shooting ranges are not lunatic-free zones anymore than any other place. Someone willing to kill themself and their own son probably wouldn't think twice about killing me too if the right wire in their brain snapped.
Some may disagree with my personal policy to not go "unarmed" on a cold firing range. A range may kick me out and ban for life for doing so. But just like many other grey areas of concealed carry, I'll keep mine concealed and accept the consequences if "caught".