anyone ever see this before?

[Redemption]

I made the mistake of letting a lot of 40 brass stack up so today I finally got around to widdling down the 1400 some on unprocessed cases I have sitting in a box and for the first time I wittnessed something I have never seen in the thousands of cases Ive processed.

This is only happened on these 4 in the estimated 500 cases I pulled today... what is this? what causes it? Thin primer cups?

[Victor Cachat]

Looks like the primers are fractured around the side walls or the walls were too thin and tore.

[Redemption]

Looks like the primers are fractured around the side walls or the walls were too thin and tore.

its def the primers that are tearing. Im still decapping and resizing and I am now up to 6 cases where the primer cup has torn now.

[FLIGHT762]

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.

[Redemption]

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.

its possible. The majority came off the indoor range, went in a 5 gal bucket in the garage, so it would have to be due to humidity moisture.

After that they went in an amazon box in my ammo and ammo supply cabinet indoors, and have been sitting waiting for me to get me **** together on 40 cal. Some of these have been sitting for up to 3 or 4 years.

Galvanic corrosion would make sense to me.

[Joezamboni]

I've been picking up some 9mm Winchester cases where the primers are crimped in place like rifle rounds. Comes out with only slightly more effort but new ones won't go in unless I ream the pockets.

[Joezamboni]

N/M, Doesn't look like a crimp on those

[Redemption]

N/M, Doesn't look like a crimp on those

Correct, no crimps on any of these casings.

Out of something like 1300-1400 casings I ended up with 8 that had torn primer cups.

Seems to me it is probably galvanic corrosion, 8 is no large loss, but never had it happen to me before.

Still interested in other theories though.

[acoop101]

That is what happens when you have wet brass corrode the primer to the case.

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[orangeusa]

Are those throw aways now? I would think so.

[Redemption]

That is what happens when you have wet brass corrode the primer to the case.

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Thats what Im figuring.

Are those throw aways now? I would think so.

the 8 cases with the torn primer cups? Yes I would think so. I have a bag I throw 22 brass, brass that fails etc so when I come across brass thats for one reason or another in too bad of shape, has cracks in it, has deep dents in the side that cant be pulled out on the resizing die I usually just throw them in that bag.

One day when it fills a 5 gal bucket ill take it with me to the scrap yard and sell it and use the money towards more scrap lead for reloading. I try to waste as little as possible.

[acoop101]

Out of curiosity with this brass wet tumbled?

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[tonyjr]

When camping / hiking / hunting - I did and still do pick up cases .
They go into sonic .
For reason or other than being lazy , people don't pick up after themselves any more .
Always carry out more than I take in .
I seldom pick up less than 100 cases and about 10% are just brass to sell .
A lot of cheap-ee factory loads . Now a lot more of the tule steel cases are showing up - still pick them up - I don't want a kid cutting his / her feet .

[Redemption]

Out of curiosity with this brass wet tumbled?

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I know there is some hot debate on this topic so I am almost hesitant to answer but no. I want my primer pockets clean and I am often working with a lot of volume on a single stage press so I always do my wet tumble after cleaning UNLESS I am shooting outdoors and end up with a lot of dirt caked brass, then it goes directly into a hot sink bath, then a short wet tumble and then after decapping a good wet tumble.

In this case these were rounds fired on an indoor range so I didnt tumble first.

When camping / hiking / hunting - I did and still do pick up cases .
They go into sonic .
For reason or other than being lazy , people don't pick up after themselves any more .
Always carry out more than I take in .
I seldom pick up less than 100 cases and about 10% are just brass to sell .
A lot of cheap-ee factory loads . Now a lot more of the tule steel cases are showing up - still pick them up - I don't want a kid cutting his / her feet .

I couldnt agree more, I was raised with the same waste not want not attitude. Their loss is my gain though.

[noylj]

>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?