Out of curiosity, I would try and duplicate the tarnish/corrosion ,( whatever it is), by applying the ingredients used in the tumbling process and letting them sit for a time. If successful, I would know what not to do in the future.
7MM Rem cases corrosion
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wonderman4
Well-Known Member
I would have to seriously consider using any of the chemicals that have been mentioned on my brass.
You did the right thing with the steel wool, but I would have used 4/0 instead.
I have dealt with a lot of things over the 55 years that I have been hand loading.
I started in the early days using 4/0 steel wool to polish my brass in conjunction with an electric drill to act as the spinner. I got very good at it before I made my first tumbler.
I doubt that your brass is "injured". If you feel safer by loading down to see if the brass has been compromised, then good for you. Just load them stout enough to seal the chamber with the brass and not get sooty cases.
You did the right thing with the steel wool, but I would have used 4/0 instead.
I have dealt with a lot of things over the 55 years that I have been hand loading.
I started in the early days using 4/0 steel wool to polish my brass in conjunction with an electric drill to act as the spinner. I got very good at it before I made my first tumbler.
I doubt that your brass is "injured". If you feel safer by loading down to see if the brass has been compromised, then good for you. Just load them stout enough to seal the chamber with the brass and not get sooty cases.
Al Arseneault
Member
Brass is cheap compared to a rifle or a gunsmith repair.
You got that right
Toss 'em and give yourself an excuse to get some ADG or Gunwerks brass (same thing). 
Yry lapua if you can get it lolToss 'em and give yourself an excuse to get some ADG or Gunwerks brass (same thing).
epags
Well-Known Member
Am donating it to my shooting club recycling program. thanks for all your suggestions.
Ed
Ed
With some RL26 or 23 to go with 'em!
LoneTraveler
Well-Known Member
What was stored in the plastic boxes before you put these cases in? That is such a smooth black corrosion, Not like the Green Gook ammonia, vinegar or certain leather processing chemicals I have dealt with. Looks very much like brass exposed to black powder, Burned black powder or a Sulphur component.
Liver of Sulphur mixed with water is used to age or blacken brass. Sulphur components seems to eat deeper into brass than just the surface.
By chance could those cartridge boxes have at one time held fired Black powder shells like 45-70 Gov..
Or been in the path of a Black Powder spilling, From filling a powder horn or loading Black powder shells.
That may explain why it is just on the neck where they contacted the bottom of the shell box.
Liver of Sulphur mixed with water is used to age or blacken brass. Sulphur components seems to eat deeper into brass than just the surface.
By chance could those cartridge boxes have at one time held fired Black powder shells like 45-70 Gov..
Or been in the path of a Black Powder spilling, From filling a powder horn or loading Black powder shells.
That may explain why it is just on the neck where they contacted the bottom of the shell box.
In other words, stop farting around your stored brass!
Tex_Hunter
Well-Known Member
Not to hijack... but what brand of car wax are you using? (I assume you are applying it to dry un-treated media right?)
I am prepping some brass to load up a bunch of hunting ammo that will probably stay loaded for several years as I shoot through all of it and really wanting to focus on not getting stuck/welded bullets.
Also interested in what type of wax you are using?
Ok , so you donated 'em. But did you get a look inside of the affected cases to see if there was the same "coating" as on the outside of the neck ??
Years ago I bought a bunch of 7.62 MG brass, a lot of which had the black staining on the case body. Loaded and shot it, but never thought much of the staining other than it was ugly. Wouldn't come off in my tumbler (then walnut vibratory), took hours in wet stainless pins to finally get it cleaned up.
The only time I have been concerned with any discoloration on brass is when I see the red rust, which is the zinc being leached out of the brass.
The only time I have been concerned with any discoloration on brass is when I see the red rust, which is the zinc being leached out of the brass.
