At the end of the day, do you leave the magazine loaded or unloaded?

I leave my P365 series magazines loaded. The springs loose most of their spring force from being cycled. They do loose some of their spring force while sitting their compressed, but not enough to worry about. That said, not all springs are created equal. Some brands of springs lose their spring force much faster than others. Also, even within the same brand, some magazine springs are significantly weaker than others.

I use a spring force gauge and measure the required magazine insertion force, as that is a very good indicator of the spring's condition. Even after cycling magazine springs over 500 times and letting them sit compressed for over a year, they are nowhere near weak enough to cause a malfunction.
 
I guess it just depends on the quality of the magazine. I had some supposedly pre-ban low-grade CZ 75 magazines (USA or National brand), bought in 1999, that absolutely lost their spring strength after being loaded for a year or two. I also would never leave polymags, like Magpul AR-platform, loaded for extended periods of time without the snap cover in-place to take the load off the feed lips.
 
I also would never leave polymags, like Magpul AR-platform, loaded for extended periods of time without the snap cover in-place to take the load off the feed lips.

Very good point. Steel does not cold flow anywhere near as fast as most plastics.

A very important consideration of the spring material is what kind of process it went though. Ideally the spring should be formed and THEN heat treated and stress relieved. Unfortunately some companies form the springs AFTER the heat treatment and stress reliving, which puts stresses back into the spring and reduces the lifespan of the spring.
 
Stop finger banging those semi-auto carry guns.

My carry guns are kept loaded and chambered in holsters. At the end of the day, the holstered, loaded, & chambered pistol comes off my belt as one unit.
The only time I unload my carry guns is to shoot them at the range and I have my own range.

Daily - weekly unnecessary unloading and handling is how you get bullet setback (in a semi-auto) and negligent discharges.
 
I don't carry revolvers, they are capacity deficient compared to a semi; that said, if I was tempted to unload a pistol magazine to "give the spring a rest" I might carry a revolver.

I keep magazines fully loaded +1 in the chamber; doesn't matter if the magazine holds 7 rounds or 15.
When the magazine spring needs replacement its not that expensive; a Glock magazine spring (for example) is $7.50
https://www.gunsprings.com/GLOCK+®/cID1/mID5/dID116#148
 
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