Rounds have weird water looking marks on them after storage

johnzhang456

johnzhang456

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Hi guys, so I've loaded some 338 LM for use and I notice these watermark looking spots on rounds after weeks of storage.

https://imgur.com/a/80DQ3FE

So I loaded 250 gr Sierra Matchking HPBTs with Retumbo in Lapua cases. I use entire RCBS setup with their lube and everything. I've loaded these before and they were fine. So I had my normal run of loading and put my rounds in the safe for a few weeks. When I opened my safe again I saw these spots. Should I be concerned? I am suspecting it has something to do with moisture or lube? Just wild guess. Any ideas? Thanks.
 
I wouldn't be concerned unless it looked like it was attacking the metal and you could feel the spots instead of just seeing them. Pretty sure I get spots sometimes after I oven dry brass. Not worried.
 
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What Big Bad said. Sweat on fingers leaves fingerprints on copper and sometimes different brands of brass. Look with a magnifying glass and see if you can see fingerprints.
 
I have seen the Lyman spray on lube that smells somewhat citrus like leave marks as such as it is most likely mildly acidic. Are they speed in a humid environment ? Here in sask we are way too dry - humidity is not one of my concerns lately.

Ave
 
So my safe is in my room which is really dry environment I suppose. Someone said it could be tarnish. As long as it does not affect shooting I think I am good. Maybe I could shoot it and then tumble it again. I use RCBS lube that comes from the Rock Chucker Kit.
 
johnzhang456 said:
So my safe is in my room which is really dry environment I suppose. Someone said it could be tarnish. As long as it does not affect shooting I think I am good. Maybe I could shoot it and then tumble it again. I use RCBS lube that comes from the Rock Chucker Kit.
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Did you de-lube the cases by tumbling or wiping with alcohol after re-sizing before charging with powder and bullet seating? Leaving lube on cases causes discolouration and can be a sticky mess with some of the spray-on lubes. A quick de-lubing tumble solves that.
 
Now that I have seen your pictures, that is just case lube. Rub it with a cotton rag. After resizing I usually tumble the brass again to remove case lube.
 
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