anyone ever see this before?

[TKM]

Small article in this months American Rifleman on the same subject. Just toss them. Too time consuming to be worth scraping the primer walls out of the pocket.

[Redemption]

>I always do my wet tumble after cleaning
Did you mean this or "after depriming?"
Isn't this a great job for a primer pocket uniformer to remove the primer band?

I usually wet tumble after depriming, some make a huge deal out of it saying that its too hard on the dies because of the potential for dirt...blah blah blah

Some topics I tend to be hesitant to respond on because I just dont want the argument.

The primer pocket scraper probably could do the job but its a lot of hassle for 8 brass, especially when I have like 1300-1400 once fired brass sitting.

Small article in this months American Rifleman on the same subject. Just toss them. Too time consuming to be worth scraping the primer walls out of the pocket.

Agreed, not worth the time, they went straight into the brass recycling bag. Did the article mention what they determined the reason for it to be?

[divingin]

Galvanic corrosion? That occurs between 2 metals with different ionic values (i.e. copper aluminum and steel, aluminum and copper, etc.) Primers are brass cups, in brass cases. Nothing to galvanize. Might be regular moisture induced oxidation, but not galvanic corrosion.

[tonyjr]

Pistol cases are hand deprimed .
Rifle cases are deprimed , sized , belled on press . Then tumbled , put in sonic or vibrated . After they are clean , they hit the little green rcbs to clean primer pocket / flash hole [ in the case of magnum cases - they get lubed with mica dust ]

[pacrat]

Galvanic corrosion? That occurs between 2 metals with different ionic values (i.e. copper aluminum and steel, aluminum and copper, etc.) Primers are brass cups, in brass cases. Nothing to galvanize. Might be regular moisture induced oxidation, but not galvanic corrosion.

Yes, both primer cups and cases are made of "brass" but galvanic corrosion can still occur, because of the different alloying metals used to make "copper" into brass. Which includes a long list of different metals depending on the properties of the alloy desired.

The case and the cup are not the same brass.

[Redemption]

Galvanic corrosion? That occurs between 2 metals with different ionic values (i.e. copper aluminum and steel, aluminum and copper, etc.) Primers are brass cups, in brass cases. Nothing to galvanize. Might be regular moisture induced oxidation, but not galvanic corrosion.

Yes I am familiar with what galvanic corrosion is (I used to be a yacht mechanic) what you have to understand is that there are types of galvanic corrosion.

Galvanic leaching is one of them. Brass is made out of Copper & Zinc, zinc is a weak or sacrificial metal and different types of brass are made from varying proportions of the two metals, Galvanic corrosion and leaching can occur even without excessive moisture (though it does speed up the process)

In this case it was probably due to galvanic leaching.

Yes, both primer cups and cases are made of "brass" but galvanic corrosion can still occur, because of the different alloying metals used to make "copper" into brass. Which includes a long list of different metals depending on the properties of the alloy desired.

The case and the cup are not the same brass.

Yeah there is something like 26 types of brass with only varying levels of Copper and Zinc. That said though I believe that when you introduce other elements into brass it becomes a bronze.

A great example of this is Gunmetal, or Red brass which is a type of bronze and contains Copper, tin, and zinc....tin is a pretty common one in bronze alloys and one of the reasons it is so expensive.... alone there is 7 variants of Gunmetal with additional elements such as tin, lead, phosphorus, Iron

Brass casings use: typically 95% copper, 5% zinc combination

Primer Cups:

Two specifications for primer cup metal are (a) 95% to 98% copper and 5% to 2% zinc with not more than 0.05% lead, 0.1% arsenic, 0.002% bismuth, 0.01% antimony, and no more than a trace of any other impurity43; (b) 72% to 74% copper and 28% to 26% zinc with the total impurities not exceeding 0.1% and not more than 0.1% lead and 0.05% iron.44

[BajaJames83]

It's happened to me a few times with crimped primer brass
223, 9mm, 40, and 45

[CSACANNONEER]

Yup, I have a batch of brass that this is happening with right now. It really sucks when running them through a progressive press and having this happen.

[Redemption]

It's happened to me a few times with crimped primer brass
223, 9mm, 40, and 45

With crimped that doesnt shock me, these were not crimped

Yup, I have a batch of brass that this is happening with right now. It really sucks when running them through a progressive press and having this happen.

***** Ill bet... pain in the *** even on a single stage.... I need to get a progressive... I am so sick of my single stage presses.

[cavemanlrrp]

All my used brass, pistol or rifle, gets deprimed fist with a Lee universal. Then cleaned before prep, now or later.

I have shot them in the back "yard", picked them up from the dirt, took them to the bench, loaded them again on the turret and took them out and shot them again.
Worked just fine, but I don't like the idea of dirt in the dies and it may not make a difference but I like clean primer pockets.

Lots of ways to skin a cat.

Best
caveman

[pacrat]

Redemption said,

Yeah there is something like 26 types of brass with only varying levels of Copper and Zinc. That said though I believe that when you introduce other elements into brass it becomes a bronze.

Copper/zinc alloys are............Brass

Copper/tin alloys are..............Bronze.

Bronze alloys are a hell of a lot harder, but much less malleable than Brass.

Quite a co-inky-dink. My first real paycheck job was as a boat builder/mechanic. I had Certifications from OMC, Volvo Penta, and Merknhaufer. Damn, just remembered that was in 1964. I must be get'n old.

[CGT80]

I had the same problem with 40 cal, but mine were dry tumbled and then run through my 1050/bulletfeeder. Most of the time, I would feel the resistance when sizing or swaging the pockets, I had one make it at least to the primer station and it blew a primer. Luckily it didn't blow the whole stack. I have no idea where the brass came from or if it was weathered much. There seemed to be a number of those in part of a 5 gallon bucket of 40 cal that I was working through.

[God Bless America]

If brass cases sit too long and get damp, the primer cups will weld themselves to the primer pocket. Looks like your cases got damp. Galvanic corrosion.

Decap what you have and send the ones that won't decap to the scrap bin.

Galvanic corrosion requires dissimilar metals. I don't think that's the case here.

[tonyjr]

My nephews go camping / hot springs . No unesal or them to bring back cases [ mostly pistol ]
Anyway maybe 1 in 20 , I will poke a hole in primers , but that does not count the green / really dirty or creased - bent ones .
I have not checked for Galvanic corrosion - I just figured cheap ammo / old / cheap thin primers .
Seldom do I have cases more than a week before they get deprimed , cleaned and reprimed . I don't reload until I get about a hundred or so .

[stilly]

Interesting... So before you store your brass, warm it for 30 minutes to chase out moisture...