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Join Date: Oct 2005
Location: In the Woods Pa
Re: moly coated
Moly bullets are coated with Molybdenum disulfide (MoS2) a common high tech lubricant. The Moly consists of separated sulfide centers, in association with molybdenum (Mo4+).
Two things happen, first disulfide can cause steel corrosion when moisture is present, and secondly the compound tends to degrade rust inhibitors like oil and grease.
The second one is easy to fix, don’t use petroleum based rust inhibitors if you use moly and expect them to be effective in preventing rust in the bore. Use plastic or syn grease/oil.
While disulfides are bad, the MoS2 is not as bad as many.
Stainless steels corrode just like carbon steels, they just do it slower.
Rifle barrels are always a problem as they are generally not visible to the eye. So if you are a regular shooter not too much problem if you are cleaning your barrel once a week, doubt you will have a problem. If you let them sit for long periods (year or more) then you might very well get corrosion in the bore. It doesn't need to be in Contact with water" only moisture like a hunid day will cause rust (with or without moly).
Moly is enough of a problem that the Navy doesn’t like to use it on board ships and seeks other lubricants.
Just some thoughts.