Thanks for the compliment, I appreciate it!
The controlling statute on vehicular carry is RSA 159:4, as follows:
159:4 Carrying Without License. No person shall carry a loaded pistol or revolver in any vehicle or concealed upon his person, except in his dwelling, house or place of business, without a valid license therefor as hereinafter provided. A loaded pistol or revolver shall include any pistol or revolver with a magazine, cylinder, chamber or clip in which there are loaded cartridges. Whoever violates the provisions of this section shall, for the first such offense, be guilty of a misdemeanor. For the second and for each subsequent violation of the provisions of this section, such person shall be guilty of a class B felony, provided such second or subsequent violation has occurred within 7 years of the previous conviction.
In short, this means that a CCW is required in order to legally carry a loaded sidearm in a vehicle.
Sans license, this seems to be able to be taken two ways, depending on how you take the meaning of "with" - does a magazine with rounds in it in the glove box while the pistol is on your hip count as "a magazine with" the pistol?
Considering that "cylinder" and "chamber" are by definition attached to the firearm, and that an empty revolver with a speedloader sitting next to it would meet the requirements of this law, a colorable argument could be made that "with" means "inserted," that you don't have to pop all the rounds out of the mag every time you get in the car.
I don't have WestLaw access anymore, so I can't look up cases to this effect, but I'm sure there are a few here and there that would clarify this question, or if there's any firearms law experts around, they might be able to answer it.