You folks who keep your extended mag tubes fully loaded are infinitely more trusting than I of inexpensive springs or you surely live in a more high threat environment.
I have two Benelli M-S90's: when in the home or my office, I prefer to keep two or three rounds max in the magazines and full side saddles (plus a bandoleer or claymore bag of rounds). If I'm deployed and when the gun is in the OpCenter, I do the same though keep one of those misbegotten slings with the shell loops with enough rounds in the shell loops to fill the magazine before moving out with it. (Don't ever carry the piece with shells in the sling and figger on mounting the weapon rapidly! It is to me, though, a nice rig to keep a full load ready to hand without mucking with spare reload in the side saddle.)
Just one technique, but it works for me and I don't worry about spring taking a set or rounds being deformed. 'Course, I also swap autoloading pistol magazines regularly and only own one pistol that doesn't have a minimum of 12 magazines--and I've heard all the stories about why springs don't take a set and about that old WW II 1911 fully loaded in a closet since VJ day that still worked immaculately after 50 years of compression.