Stan,
The problem is not the humidity, per se. The problem is condensation. If you keep the guns in the safe just a bit warmer than ambient air temperature the moisture in the air can’t condensate out on the guns. You get a bonus for having the higher humidity in that the wood is happier at 60% room humidity than it would be at 22%.
Most of the time, it is inconsistent temperature that causes the metal parts to form condensation, and get rusty.
Best,
Ted
That totally makes sense. Thanks for the explanation. I like it when something simple works so well, like that Goldenrod.