Yes,
With a Revolver and Pistol permit within the State of New Hampshire, you may carry a concealled (hidden from casual observation) loaded revolver or pistol on your person. You may also carry a loaded revolver or pistol in a motor vehicle.
Without a Revolver and Pistol permit, within the State of New Hampshire, you may carry:
A concealled (hidden from casual observation) an unloaded revolver or pistol or on your person
An unloaded revolver or pistol in a motor vehicle
An openly displayed (visual by casual observation) a loaded or unloaded relvolver or pistol.
"Loaded" is defined as with magazine, cylinder, chamber or clip containing loaded cartriages.
Generally, if you pop the magazine and unload the chambered round and place the magazine and round in your opposite pocket, the pistol will not be considered "with" the magazine, however if an officer pushes it, you could find youself defending that position in court (though unlikely)
If you don't have a Revolver/Pistol Permit for NH and you are carrying:
1) flip your shirt/coat over the butt of the gun so that it's no longer concealled. Just make sure it says flipped
2) remove the cartriages and place them in your pocket, carrier, box, etc.
3) If you are getting into a car, remove the magazine (pistol) or unload the cylindar (revolver). If you remove the magazine, place it in the glove compartment. (see above note about very unlikely, but potentially arguing your position in court)
4) Hand the firearm to someone who is properly licenced.