Polished brass??

[fguffey]

I would show you the sign, but i don't which direction to point!

And then I purchased a large plastic bucket of once fired military type cases, each one of them had a 30 cal. dirt dobber in it. I have been told there is one bee that is worst than the 30 Cal. bee, that would be the Hawaiian 20 Cal. Dirt Dobber.

One day my wife opened the garage door and saw what she thought was a black cloud leave.

F. Guffey

 

[ASbobcat]

There are two main classes of brass cases: 1. Cases for loading and shooting, 2. Jewelry.
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Now THAT is a real GEM.

 

[cw308]

I switched to wet tumbling with SS pins , just didn't like the carbon buildup on the inside of the cases . Only once I had a case stuck in the die and that was my fault by not having enough lube on the case going into a brand new die . Only takes one time to know when the case feels alittle to tight , lower the ram add a little more lube makes life easier. I like my cases to look brand new. No shortcuts , I take my time . I like reloading my own rounds why would l rush . Having a clean case stick in your chamber because its too clean . I would blame it on hot loads , not sized properly or maybe your firearm needs a good cleaning . Blaming cases being too clean I don't think so .

 

[Brians356]

I switched to wet tumbling with SS pins , just didn't like the carbon buildup on the inside of the cases . Only once I had a case stuck in the die and that was my fault by not having enough lube on the case going into a brand new die . Only takes one time to know when the case feels alittle to tight , lower the ram add a little more lube makes life easier. I like my cases to look brand new. No shortcuts , I take my time . I like reloading my own rounds why would l rush . Having a clean case stick in your chamber because its too clean . I would blame it on hot loads , not sized properly or maybe your firearm needs a good cleaning . Blaming cases being too clean I don't think so .

Q.E.D.
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[86alaskan]

I've moved from oxide coated walnut to SS media to avoid the dust. I believe that even though the carbon in the neck is gone from SS tumbling, it is essentially the same as reloading new brass. I get that the carbon can aid in seating and release, but how many of you fire form fresh brass and still get excellent groups? I think that the shiny clean necks would give better than fouled results as the cleanliness is more consistent than a thin layer of randomly deposited carbon.

 

[cw308]

brians356
Sorry I'm old school , what does Q.E.D. mean ?
86alaskan
I see we're on the same page , good clean reloads.

 

[Richard Coody]

brians356
Sorry I'm old school , what does Q.E.D. mean ?
86alaskan
I see we're on the same page , good clean reloads.

actually i believe it was used in a sarcastic context

Quod erat demonstrandum (Latin what had to be proved or what was to be demonstrated); placed at the end of a mathematical proof to show that the theorem under discussion is proved.

 

[cw308]

Richard Coody
Thanks Rich . Latin I have enough trouble with English .

 

[spitfire_er]

I've sized both before and after. Over the past 10 years sizing 10's of thousands of cases, I've only got one unpolished 308 win case stuck in that time and it was due to me being in a rush and not properly lubricating the case. This was just a few months ago too, so I should have known better.

 

[Brians356]

I see we're on the same page , good clean reloads.

Not really, I don't subscribe to making cases into jewelry. Even if there was some demonstrable benefit, too much work. A fun hobby for the right personality I suppose.
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[cw308]

Hey brians356
Will be following your posts . Q.E.D.

 

[divingin]

There is a second result of tumbling, also well described by Varmint Al, that chamfering will not resolve. Work hardening also occurs, depending on the length of time tumbled. From my experience it can be so severe as to require excess seating pressure to overcome greater neck tension, regardless if neck diameter.

I'd suggest a read of this article, which seems to refute what you have discovered:

https://www.ampannealing.com/articles/40/annealing-under-the-microscope/
https://www.ampannealing.com/articles/42/annealing-under-the-microscope/

 

[ASbobcat]

I'd suggest a read of this article, which seems to refute what you have discovered:

https://www.ampannealing.com/articles/40/annealing-under-the-microscope/
https://www.ampannealing.com/articles/42/annealing-under-the-microscope/

Very interesting reading. Thanks for posting this.

There were at least two interesting points to consider.
First, they DID NOT CLEAN (brush) inside of necks of the un-tumbled batch. They concluded that (1) carbon buildup does act as a lubricant and (2) left uncleaned this results in "inconsistency" in bullet seating tension. That is why neck brushing is an essential step in case prep, to avoid this inconsistency. So why would they choose to not do it?
And secondly, they chamfered tumbled brass (you can see the fresh cut in the photos). Why would they need to do this unless it was to correct the "rolled over lip" effect that I mentioned. You notice they made no mention of that in their testing.

All I can say is that, while laboratory testing makes interesting reading, a high velocity extractor narrowly missing my eye taught me a more valuable lesson.

 

[people]

I always polish my brass first. I used to just make sure they were clean but 7.62 brass is just too hard to resize with out polishing fist. Since then I polish everything before resizing. There is a huge difference in force required in old casings VS polished. Polished is so much easier.