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A tiny amount of steel makes a large amount of rust. After it's cleaned, check for pitting from the rusting. Minor pitting doesn't mean a barrel is destroyed.
Make sure it's really rust before you decide to trash the barrel. It may be copper fouling. Rust will come off with a brush and solvent, copper fouling takes a ammonia based cleaner. BSW
Rust is hard to remove with traditional bore cleaning methods. I usually clean as best I can, then shoot the rifle - that usually gets rid of it. This method assumes the barrel is not badly obstructed...
As mentioned you may be left with some pits... barrel will still work.
Well, I am picking up a husky 6.5x55 this afternoon. The bore looks shiny to almost the muzzle, where it then looks like some light rust. So I guess I will try giving it a good cleaning, and see what happens.
Some gun oils help removing rust. A long while ago I bought a can of oil marked "Ronson" and only becasue it had a little picture of a rufle on it. This stuff helps loosen the rust off especially in combination with steel wool. I got the oilcan off the shelf in one of the department stores in Ontario but have no clue now which one it was.
There are some very effective rust removers on the market, but there is a caveat: They may also remove the bluing from a firearm, so one has to use them with caution. Regards, Eagleye.