Alright. This morning I stripped the mags, used some Hoppes #9 to clean them then sprayed Ballistol lubricant (that I got at the hardware store this morning on the suggestion of one of their helpers). I reassembled the mags, loaded them, then put them in the freezer for ~15 min. They function...
I used both Armscor and Aquila with the same results. It isn't the action since I can work the mag outside the gun and it is still sluggish.
As for what Ruger had to say, I was speechless.
Ruger said that it must be the metal mag contracting in the cold and there is nothing they can do about it. I don't know if a dry lube will help but I'll give it a try tomorrow.
(sorry for not mentioning the temp but it was cold rather then freezing)
I've got a Mark 3 Hunter that I bought used. Worked perfectly in the indoor range that I used to sight it in the other day but when I took it out squirrel hunting in the cold, the magazines (any of the 3) stopped functioning. The spring slowed down so much that the gun would not cycle. I took...