^^ This. ^^My range rules (in no specific order) concerning your question are:
1- Unarmed people make me nervous.
2- We perform some drills with unloaded guns, but as a policy, I will not send you off the firing line without a loaded gun in your holster.
3- I run a hot range. All guns are always loaded - so, unless on the firing line and it is clear downrange, there is no reason your gun should be out of your holster other than immediate self-defense.
4- If you show up armed, just leave your gun in the holster. We do all gun handling on the line.
5- I don't use live guns in the classroom, nor do I ever unholster any of mine in the classroom.
Short of cavity searching each student and locking them in a cell, we can make all the "no ammo, no live guns", etc., rules we want and it will still amount to taking everyone's word for it. I don't take anyone word for it - I simply assume all guns are loaded and present the class accordingly. When guns are out on the firing line, we can avoid muzzles and work around them. When I see a gun out anywhere off the firing line I know we have a problem on one level or another.
It should be noted that very few of those I've instructed have been 'absolute' beginners. They may be taking the NRA Basic Pistol, etc. course, but they've grown up hunting and shooting or something, for the most part.