Your understanding of THIS proposed law is fundamentally flawed. If this law passes, possession of large capacity magazines will be illegal in Connecticut. Period. The proposed law specifically says that you will have 90 days to either remove them from the state, or turn them in to the police.
How can you possibly infer from that that keeping them in the gun safe would be legal?
Ditto. You can infer that it is legal to own the magazine and possess it for 89 days in order to get rid of it outside of the state borders, but to have it on the 91st day, in a safe or on your person, is a felony, from the law quoted. This is NOT a california law, were I can own my hi-cap mags for my Baby Eagle as I've had the mags for 1 month longer than the ban [I planned ahead!]. Heck, I can even use mine at the range. I could probably use them for home defense, but that would open me up to attack by the DA or the lawyer of the family of the POS who threatened my family.
The previous post about storing it in a safe makes as much sense as saying that I could store a selectable-fire, pistol-grip equipped, detachable 30+ round AK/M16/FN-FAL variant with a 14" barrel in my safe and not be committing a felony [I'm in california, btw]. Heck, I may as well have a mini-gatling gun in there, as far as my state is concerned. If no one ever opens the safe I might get away with it. If anyone ever saw it I could be arrested and lose everything.
An extra 3-5 rounds in my pistols isn't worth the risk of loss of gun rights, home, spouse, job, money lost and meeting 'bubba' in prison [start banjo music!]. I'd rather work on my tactical reloading and my shot placement skills.
Or keep two loaded guns by the bed and use them both for 20 legal rounds!