I'm reloading a 1000 rounds of 41mag. I started out by tumbling them in batches of 250, using brand new walnut media for 3 hours at a time.
These pieces were brand new only fired once, using 7grs of Unique. Some were loaded with 210gr berries and some were loaded with 210gr cast.
As I was reloading I noticed that about 50-60 pieces of brass out of the whole total amount had large black stains on them. The black marks won't come off by just trying to buff them.
The odd part about it is the brass was fairly clean and blemish free before I started tumbling them. The tumlber was dry and clean before I started. Also I'm positive they didn't come in to contact with any chemicals or moisture.
41mag brass cost me over $150 a 1000. So I would like to clean them by hand but the only thing that I can think of that cleans brass is brasso and I don't want to use that.
Any one ever seen this happen before and have a cure for it?
These pieces were brand new only fired once, using 7grs of Unique. Some were loaded with 210gr berries and some were loaded with 210gr cast.
As I was reloading I noticed that about 50-60 pieces of brass out of the whole total amount had large black stains on them. The black marks won't come off by just trying to buff them.
The odd part about it is the brass was fairly clean and blemish free before I started tumbling them. The tumlber was dry and clean before I started. Also I'm positive they didn't come in to contact with any chemicals or moisture.
41mag brass cost me over $150 a 1000. So I would like to clean them by hand but the only thing that I can think of that cleans brass is brasso and I don't want to use that.
Any one ever seen this happen before and have a cure for it?
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