Okay, I'll chime in here with the entire text of the statute that covers concealed carry in vehicles, just as it seems like a good place to start with this discussion:
"18-12-105. Unlawfully carrying a concealed weapon - unlawful possession of weapons.
(1) A person commits a class 2 misdemeanor if such person knowingly and unlawfully:
(a) Carries a knife concealed on or about his or her person; or
(b) Carries a firearm concealed on or about his or her person;
(c) Without legal authority, carries, brings, or has in such person's possession a firearm or any explosive, incendiary, or other dangerous device on the property of or within any building in which the chambers, galleries, or offices of the general assembly, or either house thereof, are located, or in which a legislative hearing or meeting is being or is to be conducted, or in which the official office of any member, officer, or employee of the general assembly is located.
(d) (Deleted by amendment, L. 93, p. 964, § 1, effective July 1, 1993.)
(2) It shall not be an offense if the defendant was:
(a) A person in his or her own dwelling or place of business or on property owned or under his or her control at the time of the act of carrying; or
(b) A person in a private automobile or other private means of conveyance who carries a weapon for lawful protection of such person's or another's person or property while traveling; or
(c) A person who, at the time of carrying a concealed weapon, held a valid written permit to carry a concealed weapon issued pursuant to section 18-12-105.1, as it existed prior to its repeal, or, if the weapon involved was a handgun, held a valid permit to carry a concealed handgun or a temporary emergency permit issued pursuant to part 2 of this article; except that it shall be an offense under this section if the person was carrying a concealed handgun in violation of the provisions of section 18-12-214; or
(d) A peace officer, as described in section 16-2.5-101, C.R.S., when carrying a weapon in conformance with the policy of the employing agency as provided in section 16-2.5-101 (2), C.R.S.; or
(e) (Deleted by amendment, L. 2003, p. 1624, § 46, effective August 6, 2003.)
(f) A United States probation officer or a United States pretrial services officer while on duty and serving in the state of Colorado under the authority of rules and regulations promulgated by the judicial conference of the United States.
Source: L. 71: R&RE, p. 482, § 1. C.R.S. 1963: § 40-12-105. L. 73: p. 683, § 3. L. 77: (2)(c) amended and (2)(d) added, p. 976, § 8, effective July 1. L. 81: (2)(c) amended, p. 1437, § 3, effective June 8. L. 86: (2)(d) amended and (2)(e) added, p. 774, § 2, effective July 1. L. 89: (1)(d) added, p. 911, § 1, effective April 15. L. 93: Entire section amended, p. 964, § 1, effective July 1. L. 94: (2)(e) amended and (2)(f) added, p. 647, § 1, effective July 1. L. 2000: IP(2) amended, p. 1009, § 1, effective August 2. L. 2003: (2)(c) amended, p. 648, § 3, effective May 17; (2)(d) and (2)(e) amended, p. 1624, § 46, effective August 6.
Cross references: For affirmative defenses generally, see §§ 18-1-407, 18-1-710, and 18-1-805."
As the others have mentioned, the DOW has rules regarding the transportation of weapons in vehicles, but I'm not sure if these statutes would be enforceable against persons who were not engaged in hunting-related activities. The statute text doesn't say anything specifically about this being an issue only for hunters, however the text of the law does seem to be geared towards hunters:
"33-6-125. Possession of a loaded firearm in a motor vehicle.
It is unlawful for any person, except a person authorized by law or by the division, to possess or have under his control any firearm, other than a pistol or revolver, in or on any motor vehicle unless the chamber of such firearm is unloaded. Any person in possession or in control of a rifle or shotgun in a motor vehicle shall allow any peace officer, as defined in section 33-1-102 (32), who is empowered and acting under the authority granted in section 33-6-101 to enforce articles 1 to 6 of this title to inspect the chamber of any rifle or shotgun in the motor vehicle. For the purposes of this section, a "muzzle-loader" shall be considered unloaded if it is not primed, and, for such purpose, "primed" means having a percussion cap on the nipple or flint in the striker and powder in the flash pan. Any person who violates this section is guilty of a misdemeanor and, upon conviction thereof, shall be punished by a fine of fifty dollars and an assessment of fifteen license suspension points.
Source: L. 84: Entire article R&RE, p. 876, § 1, effective January 1, 1985."
Regardless, you can carry a long gun in a vehicle with a loaded magazine, even if CRS 33-6-125 does preclude you from having a round in the chamber. As a matter of personal opinion here, I don't see any reason to keep a long gun chambered in a vehicle (we don't even do so in LE).
