[dmazur]

Springs loaded to normal deflection aren't weakened

It's similar to loading a brand new magazine to full capacity for about a week to soften up the spring.

The number of cycles is what causes spring wear, not normal compression. GI magazines stored loaded since 1945 have functioned fine.

So, whether you're working on your recoil spring or magazine springs, they aren't going to get "softer" with compression and time.

As posted by another, if you cycle the action a few thousand times, you may see some spring wear. However, the action may not function reliably at that point...