I had issues with this and it was a real pain to get a good solution.
I tried heaps of different moisture absorbers and products but I found nothing worked as good as hanging one of these things on the inner door of my safe via a hook. It is amazing how much moisture they collect, every 2 - 3 months it is full.
https://www.bunnings.co.nz/dampfree-...-pack_p0011488
The tub versions like below are okay but they don't collect as much I find, I still stick one of these in the bottom of my safe but it is much slower to fill up. I think the hanging bag version above works better as it sits parallel to the rifles vs just at the bottom of the safe. Since putting the bag in I've had zero issues with surface rust/moisture issues on anything.
Tub version:
https://www.bunnings.co.nz/sunfresh-...-pack_p4510996
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