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Old 03-18-2009, 10:11 AM
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driftrider
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Join Date: Feb 2003
Location: Coralville, IA. USA
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Default RE: moly-coated bullets

The other drawback to moly, which is short for molybdenum disulfide MoS2, is that it's very hygroscopic, meaning that it attracts and absorbs moisture from the air, but it provides NO protection against corrosion. What this means is that in a humid or moist environment, the MoS2 will soak up water and hold it in the bore, which will cause the bore to rust unless the bore is coated with a good layer of an oil based preservative. Of course, this is fine in storage, but the oil should be removed before firing or going into the field, so that rainy day in the woods could result in a rusted/pitted barrel. Not good.

Mike

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