I would rate them as follows, considering the mags are as designed and new condition.....
1) Any standard mag with my GTHQ follower spring installed, (lifetime!, loaded or not!)
2) New Mec-Gar mags with nylon followers.. I believe spring improved!
3) 06/29 Swiss, top quality, maybe the best Luger mag ever...
4) New code 122 or fxo
5) all the rest?? all the same?? (I've replaced hundreds if not a thousand or more, of springs in these mags..... )
This is just my experience on what I think would stand up to full load storage.. the only one I can guarantee is mine!...
... best to all, til...lat'r....GT......
