10 round

I am a new firearms owner and have heard that loading a magazine and leaving it loaded will weaken the spring over time. Is this true and should I avoid loading magazines and storing them in my gun safe. I live in NY and we live under the draconian safe act and can only have 10 round magazines...

I have a SP2022 9mm. It came with the 15rd magazine. I have access to get some 10rd magazines locally. I suspect there is no difference between 15rd and 10rd magazines (other than capacity), and that the 10rd will work in 15rd guns. I'd end up leaving the 10rd in the house, and using my 15rd...