ETA: First make sure you are using the entire new PA:
http://www.cga.ct.gov/2013/act/pa/2013PA-00003-R00SB-01160-PA.htm
Looks like I was wrong on two counts, the way I read the law it states you will still need to declare them and I see no exemption for you to have more than 10 rounds in the mag outside your home or a range either, I think (and I only looked quickly and will double check) that the CT legislature pulled a NY and forgot to exempt LEOs from carrying more than 10 in their mags, the only exemption I see it that you can purchase, possess and import, not sure how you will go about registering them after the deadline, just another mistake in the bill....here's the pertinent sections
(d) A large capacity magazine may be possessed, purchased or imported by:
(1) Members or employees of the Department of Emergency Services and Public Protection, police departments, the Department of Correction or the military or naval forces of this state or of the United States for use in the discharge of their official duties or when off duty;
(2) Employees of a Nuclear Regulatory Commission licensee operating a nuclear power generating facility in this state for the purpose of providing security services at such facility, or any person, firm, corporation, contractor or subcontractor providing security services at such facility; or
(3) Any person, firm or corporation engaged in the business of manufacturing large capacity magazines in this state that manufactures or transports large capacity magazines in this state for sale within this state to persons specified in subdivision (1) or (2) of this subsection or for sale outside this state.
Sec. 24. (NEW) (Effective from passage) (a) Any person who lawfully possesses a large capacity magazine prior to January 1, 2014, shall apply by January 1, 2014, or, if such person is a member of the military or naval forces of this state or of the United States and is unable to apply by January 1, 2014, because such member is or was on official duty outside of this state, shall apply within ninety days of returning to the state to the Department of Emergency Services and Public Protection to declare possession of such magazine. Such application shall be made on such form or in such manner as the Commissioner of Emergency Services and Public Protection prescribes.
(f) Any person who declared possession of a large capacity magazine under this section may possess the large capacity magazine only under the following conditions:
(1) At that person's residence;
(2) At that person's place of business or other property owned by that person, provided such large capacity magazine contains not more than ten bullets;
(3) While on the premises of a target range of a public or private club or organization organized for the purpose of practicing shooting at targets;
(4) While on a target range which holds a regulatory or business license for the purpose of practicing shooting at that target range;
(5) While on the premises of a licensed shooting club;
(6) While transporting the large capacity magazine between any of the places set forth in this subsection, or to any licensed gun dealer, provided (A) such large capacity magazine contains not more than ten bullets, and (B) the large capacity magazine is transported in the manner required for an assault weapon under subdivision (2) of subsection (a) of section 53-202f of the general statutes, as amended by this act; or
(7) Pursuant to a valid permit to carry a pistol or revolver, provided such large capacity magazine (A) is within a pistol or revolver that was lawfully possessed by the person prior to the effective date of this section, (B) does not extend beyond the bottom of the pistol grip, and (C) contains not more than ten bullets.
(g) Any person who violates the provisions of subsection (f) of this section shall be guilty of a class C misdemeanor.
The reason I feel section 24 even applies to the exempted people listed is because it includes a way for: "such person is a member of the military or naval forces of this state or of the United States and is unable to apply by January 1, 2014, because such member is or was on official duty outside of this state, shall apply within ninety days of returning to the state" since they were listed as an exemption in the first section, I can't see how section 24 could not apply to all the other exempted people....ouch, you may have stumbled on a huge flaw in this bill, who wants to confirm that police are not exempt from the 10 round carry outside the home law and leak it to the press.......
