In a drum loaded?  Looking to venture in the ultra high capacity world and I do keep only some of my magazines loaded, like a third of my stash.  I leave the rest in new unused condition but stored away for back up purposes.  For those who have used 100 round drums or similar, are the springs performance comparable to a USGI spring?  As in okay to leave fully loaded have no effect, just the compression cycles wear the spring out?  Only interested in drum type magazines

http://www.betaco.com/cmag_faq.asp