Laws might differ between the greater Las Vegas area and northern rural Nevada, I don't know for sure. I own a double barrel shotgun but am planning on obtaining a pistol, likely .38 caliber. I like to explore ghost towns, but carrying a heavy antique shotgun, digital cameras, a GPS and a video camera can get rather clumbsy.
When I go exploring with a buddy of mine, he lends me his wife's S&W snub nose .38 and a nice belt holster, which you hardly know is there. He had a close encounter with his wife last autumn, as both are avid rock collectors, when he entered a mine adit with his wife and came face to face with a lion. He had been carrying his gun all day, but this time he left it in the truck.
My understanding is that you can carry any gun in your vehicle loaded, as long as there is no round in the firing chamber. So, this makes my double barrel illegal to carry loaded (which I don't) because of its design. But a standard pump or semi-auto shotgun is legal to carry loaded as long as the firing chamber is empty.
I've seen on numerous occasions pistols in belt holsters in my neck of the sagebrush, but in plain sight. It is my knowledge that a concealed carry permit is fairly easy to obtain.
California gun laws are always changing, and changing for the stricter for the law abiding citizen; but doesn't do a dang thing to stop the criminal from always having the upper hand. The police, it seems, can't even pull their guns until the criminal's bullet is beginning to penetrate their skulls. And if they do, they get desk duty until the slow and rusty bureaucratic gears lurch and stop for weeks until they are cleared or disciplined.
The parks, such as Death Valley, have far stricter laws about carrying weapons. Which are not allowed to be used at all (although I've nearly been mowed down by some lunatic, so-called, 4WD club spraying automatic weapons in wide circles all around Chloride City ghost town about 1997 ...
). It is my understanding that any weapon be completely broken down, in a locked case and not in reach of the owner.
The NDOW (Nevada Department of Wildlife) website has a lot of general law information on guns in Nevada, not just the hunting laws.
http://www.ndow.org/