By Groton, on the Niantic river.
I’ll be there part of Oct into early Nov.
Here is a partial list:
Ledyard Sportsman club: Not open to the public
Norwich Fish and Game Association: Does not appear to be open to the public
Niantic Sportsmen's Club: Does not appear to be open to the public
Quaker Hill Rod and Gun Club in Montville open to the public on Sundays
https://quakerhillrodandgunclub.org/skeet-range.aspxI'm in central CT and don't know much about the clubs down by Groton. Check to see if they are open to the public. I am normally at Manchester Sportsmen's in Coventry every Sunday.
http://ctskeet.com/where-to-shoot-skeet-in-connecticuthttps://ctguns.org/t/list-of-connecticut-shooting-ranges-and-clubs/580https://www.shooting.org/ranges/connecticutI'm sure you are aware of this, but better safe than sorry: You can not buy ammo in CT with a CT Ammo Permit, Hunter's license or CT Pistol permit.
https://legalclarity.org/interstate-gun-laws-in-connecticut-what-you-need-to-knowI would strongly recommend NOT going into Massachusetts or RI with a gun in the car.