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No, your 357 magnum ammo is not corrosive. The hoppe's 9 reacted to copper from the bullet on the case. I use hoppe's 9 to clean the bore of my firearms, and if, the solution is, left in the bore running a patch the next day will sometimes result in the patch coming out a greenish/blueish color. A lot will depend on how much copper is left in the bore, depending on how many rounds are fired and the condition of the bore/rifling. At least that has been my experience with my firearms.
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