1. I don't think burnt powder residues are protective so after each day when I've fired it, I'll put some sort of oil in it. In the bush, it's just a waterproof oil, not even trying to clean out fouling. At home, it's carbon solvent and every 100-200 shots copper solvent but I'm not sure how often you really need to do that.
2. I always dry patch out the barrel after cleaning so its stored ready to fire. Prevention for senior moments. The dry patch doesn't remove 100.00% of the oil so it is still protected against the elements. A 22 might lead a shelterd life and a target rifle even more so (those are the guys who say the "never clean the bore") but out hunting in NZ your barrel will have a short life if you carry it actually dry. Of course, if you don't plan on using the rifle for more than 10 or 20 years you can afford to be a bt more casual ....
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