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  #1  
Old 05-19-2017, 09:03 AM
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Brass cases with rough texture


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Have you guys seen brass cases with an odd rough texture to the outside? I was given a bunch of old 30-06 brass with such a texture a couple years ago, and I thought perhaps it had been painted. I didn't think much of it, and I threw it away.

Yesterday I came across a few cases that had a similar roughness to the exterior, but these don't look painted or otherwise altered.

Does anyone know what I'm talking about? I can provide some pics if needed.

thanks, jake

EDIT:
Finally had time to snap some pics. And perhaps "rough texture" isn't the correct description. Maybe "pitted" is what it's called. I just know nothing I've ever done has caused it. These were cases given to me or came with a "bulk" batch of used brass. I do not intend to use them. I'm just curious what's going on. It's almost like a "refinish" or horrible paint job of some sort. As a little further evidence in the mystery, I tried annealing a couple of them, and they want to burn and put off a nasty green color.
Attached Thumbnails
Brass cases with rough texture-case1.jpg   Brass cases with rough texture-case2.jpg  

Last edited by jakesnake66; 05-21-2017 at 08:58 AM. Reason: Added pics
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  #2  
Old 05-19-2017, 09:15 AM
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I vote for pictures.
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  #3  
Old 05-19-2017, 11:57 AM
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There's a case cleaning chemical that turns brass yellow, rough and ugly using citric acid. Otherwise, no.
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  #4  
Old 05-19-2017, 01:12 PM
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The only brass I've some across like that was some Remington, but that was because of someone having shot them from a dirty chamber. After running them through my clean chamber they came out looking perfectly fine. So other than that, I can say I have.

SMOA
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  #5  
Old 05-19-2017, 02:55 PM
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If they chamber, oughta really get a grip on the chamber wall!
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  #6  
Old 05-19-2017, 09:57 PM
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Quote:
Originally Posted by kdub View Post
If they chamber, oughta really get a grip on the chamber wall!
Which is a good thing provided the spring back as they should.

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  #7  
Old 05-20-2017, 06:05 AM
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I have seen pitted brass found on a WW2 military range that was found. Some was pretty good, others were literally falling apart.
Insofar as new brass, never saw such.
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  #8  
Old 05-20-2017, 08:25 AM
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Brass under high pressure that has to stretch a lot because of excessive head space?

Rifles have mostly lines going around the body.

Pistol looks like spider webs.

A photo would be nice.
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  #9  
Old 05-20-2017, 09:42 AM
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Rough finish, matte finish, or pitted? I've seen rough finish brass that was fired in a machine gun, possibly a dirty chamber". I have some very aggressive tumbling media (hard resin pyramids) that leaves a matte finish on the brass. and I've seen some brass in the earlier stages of corrosion with wee small "pits" in the surface. Rough and matte get reloaded, pitted gets tossed.....
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Old 05-20-2017, 11:39 AM
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I believe Acids in any concentration over time selectively attack the Ingredients of Brass Alloys selectively, with the Most active ingredient being attacked first and most aggressively. In a Copper-Zinc Typical brass, the Zinc would be attacked before the Copper, possibly leaving a "rough surface finish".

Chev. William
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  #11  
Old 05-20-2017, 01:03 PM
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If I got case's like that, I'd just dump'em. Probably nothing wrong with them but I wouldn't risk it.
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  #12  
Old Yesterday, 05:21 AM
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I clean the worst of cases with vinegar, I purchases 1,400 cases once fired military cases at a flea market in Buck Horn NC. It would have required 7 days of tumbling to get started; I cleand the vases in 5% vinegar for 15 minutes, after washing and rinsing I tumbled the cases for 1 hour.

Soaking in vinegar: Time, I soak the cases in vinegar for a maximum of 15 minutes for the life of the case. If my cases were rough I would spin them, I make spinners, when spinning the cases I start with 3M green pads and then move to steel wool.

I like 100% contact between the case and chamber, same for the contact between my disc pads and rotors, nothing beats 100% contact. I know, reloaders believe a rough surface has more cling but if the case travels as much as reloaders believe, that is a whole lot of rubbing, scratching etc.

F. Guffey
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Old Yesterday, 06:02 AM
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it would be good if I could help the kid learn how to neck '08 brass down to .284. Can any of you help us out?

I use forming dies, my favorite forming dies are short forming dies. I would neck the case neck down to 7MM without reducing the length of the chamber from the shoulder to the case head. Most reloaders claim they move the shoulder back and I always ask; “How do you do that?”, Because, I can not move the shoulder back on a case with case body support.

After necking the cases down then size the cases to chamber. In the perfect world the 308 fired case lengths from the shoulder to the case head should be .004” longer than the minimum length/full length sized, factory, over the counter new ammo case.

Again, I use forming dies, it is possible to neck size with a full length sizing die, it is possible to for all of it meaning neck sizing and full length case sizing but to help the your reloaders I believe it is necessary fom him to have a good understanding of the threads on the die and press and the effect the threads have on sizing.

F. Guffey
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  #14  
Old Yesterday, 08:38 AM
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pics added to the OP

I don't know if editing my original post or adding a reply is the better way, so I'm doing both. I added two pics to my original post and I've got plenty more.
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  #15  
Old Yesterday, 08:51 AM
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I saw the pics and while the brass looks like it may be structurally strong, the finish, light pitting, does indicate the ammo is pretty old and mebbe not well stored. I don't think I'd use it...
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  #16  
Old Yesterday, 08:56 AM
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It looks like it was tumbled with road base gravel. I'd call it scrap.
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  #17  
Old Today, 02:59 AM
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Quote:
Originally Posted by fguffey View Post
Soaking in vinegar: Time, I soak the cases in vinegar for a maximum of 15 minutes for the life of the case. If my cases were rough I would spin them, I make spinners, when spinning the cases I start with 3M green pads and then move to steel wool.
Citrate and acetic acid are often used, (at elevated temperatures), in the biotech industry for mild surface passivation at a defined number of process cycles. The initial post rinse is often a low concentration of sodium bicarbonate, followed by deionized water.

I wonder if that might be suitable for brass/vinegar applications?
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  #18  
Old Today, 03:07 AM
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The pics show enough pitting on those cases to make me wary - I'd scrap them.
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  #19  
Old Today, 03:52 AM
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Quote:
Originally Posted by JBelk View Post
There's a case cleaning chemical that turns brass yellow, rough and ugly using citric acid. Otherwise, no.
Bull citric acid will not do that in the normal time cases are cleaned that is either bad contamination in the brass that has been etched out or it's been soaked in something like ammonia or something that eats copper or zinc .
I am tipping organic contamination that has been dissolved out leaving it rough .
The clue is the geometric shapes to the pits in the brass .
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  #20  
Old Today, 04:09 AM
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Looks sand-blasted. Or tumbled in sand. The left picture has a white powdery appearance. Sorta like the post on a old car battery. Maybe the ammonia thing like Country is thinking?
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