I should know by now..

[shaunbowler@yahoo.com]

Is there a period of time that rounds stored in magazines begin to effect the "action" of the magazines?
SB

[TKM]

There hasn't been enough time since magazines were invented for there to have been any adverse effects.

[jeffyhog]

I've read that storing magazines loaded does not weaken the spring. It is loading and unloading of the magazine that wears out the spring

[AreWeFree]

Magazines are consumables, plan for failures, test often, and replace as needed.

[shaunbowler@yahoo.com]

Thank you all.
Merry Christmas.
SB

[The Gleam]

Is there a period of time that rounds stored in magazines begin to effect the "action" of the magazines?
SB

No. A spring compressed or relaxed for long periods will not change. It's the constant use of compression and decompression that changes it's tension.

HOWEVER... magazines stored for long periods of time have seen their bodies bow out or expand, floorplates deteriorate or crack, or feed lips expand unfavorably. Keep an eye on those parts, but the springs will rarely (if ever) suffer changes.