Keep one of these in the safe/drawer/closet wherever you keep your gun and ammunition if possible. Also, leave a small layer of oil on it. Humidity is your enemy.
Hornady 95902 Dehumidifier Canister https://www.amazon.com/dp/B07KCRKDD5?ref=ppx_pop_mob_ap_share
Ohh interesting. Like this thing?: https://www.amazon.com/dp/B07KCRKDD5/ref=cm_sw_r_apan_glt_i_2557GV6WX2XDD305MTB1
Hornady 95902 Dehumidifier Canister,Black https://www.amazon.com/dp/B07KCRKDD5/ref=cm_sw_r_cp_api_fab_54sEFbTFGE9QH
Keep this in the safe and then the smaller grey ones in my ammo cans