I have 2 Tikka 3tx in Stainless in 243 & 22.250, both have seen plenty of Scottish rain & foggy damp weather, & both show no signs of rust, I made myself a temp controlled drying
cabinet,basically a lined insulated old gun cabinet (bolted fixed to wall in gun room next to normal cabinets) this is fitted with reptile heat strips / mats to sides and back of cabinet
with Habitat pulse stat to control the temperature , I switch cabinet on before I go out or if I'm away for few days I'll set it on electronic timer to switch on prior to my return, (could
also be controlled remotely by a wifi on/off switch if required)
As it's pulse thermostat & not an on/off stat, temperature stays constant to wherever it's set with no drop, probe reads temp inside cabinets, thermostat affixed to outside of cabinet. - (cheap to run)
(I used to breed/keep snakes, so had the kit there) - may sound excessive to some but works a treat) so on returning home, if been out in the wet / damp conditions etc rifle wiped down dry rag/paper etc
stripped & sprayed with WD40 & placed in the heated drying locked cabinet normally overnight, removed next checked over & wiped down with an oily rag & put away in proper cabinet,
do this with all my rifles / SG never once had any rust issues..

& more importantly I don't have to worry about leaving FA unsecured in an area to dry, as this cabinet also has been inspected/passed by FAO.