Author Topic: What are merits of different grain size tumbling media?  (Read 3536 times)

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Offline Clint007

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What are merits of different grain size tumbling media?
« on: July 07, 2020, 04:03:15 PM »
I dry tumble sometimes but only after depriming and SS wet tumbling, and my goal is to reduce tarnish but also I found it really helps prevent powder funnel stick. I don't like the One Shot aerosol on general health principles, but it certainly works and leaves no real residue on the cases. But...if I can 'dry tumble lube' cases en masse and prevent tarnish at the same time, I'd be happy.

Even with prolonged separating in my Dillon separator, I get retained dust inside cases from this media I bought at Dillon. This Dillon corn is pretty finely grained.  Since the primers are long gone and the pockets are squeaky clean,  I've taken to blasting the cases a dozen at a time with an air compressor just out on my driveway.  Works, but takes too much time, tho, and I wondered, since I'm using this to prevent tarnish and to lube the cases to prevent powder funnel stick, maybe there's a coarser grain size that would have less dust retention?

My goals as always are to have as many cases processed in as short at time as possible.

Since my dry tumbling is NOT to clean the cases, but more to act like a tiny NuFinish applicator to every square millimeter of case surface, I even wondered about using polymer media but have zero insight into that. Corn is cheap and plentiful, so I can stick with that.... but would like less dust.  Coarser grain?

Walnut alters the sheen of the case, not in a bad way, just different. But it is harder and seems less absorbent and I don't know if it's as good an applicator of NuFish as corn would be....

Thanks for any insight and/or experience.

C
Temere phrase latine usus sum ut magna canetis

Offline painter

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Re: What are merits of different grain size tumbling media?
« Reply #1 on: July 07, 2020, 04:16:31 PM »
Other than having fewer fines, I don't think coarser media is going to make much difference regarding the dust...dry corn cobs are dusty.

Larger media will increase the chance of blocking flash holes.
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Offline George16

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Re: What are merits of different grain size tumbling media?
« Reply #2 on: July 07, 2020, 04:32:53 PM »
I wet tumble and polished with corn cob and walnut media all my brass. I don’t get the tarnished and water spots since my house has a whole house water softener. I also use 20-40 grit corn cob and put strips of fabric softener to minimize the dust.


Offline Wobbly

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Re: What are merits of different grain size tumbling media?
« Reply #3 on: July 07, 2020, 05:30:51 PM »
• I used to tumble with coarse corn cob intended for Gerbil litter. Some flakes were so big they got stuck inside 223 cases. They could easily get it, but not back out. That makes for a dangerous reloading situation. Starting out, I tumbled with primers left in. So I didn't see the issue with 9mm, 45ACP and 38 cases and larger media. But it was mandatory I go with much smaller grain media when tumbling rifle cases.

• Lately some of those left over cases are getting reloaded using my 650 with case feeder. The large media also seems to not play nicely with my case feeding disk inside the case feeder. I've had quite a few disk jams I couldn't figure out, then I started seeing those random large hunks of corn. No more issues with .03-.04" corn cob media and/or wet stainless pin tumbling.

• I live way out in the boonies. Gun stores only sell Taurus and ARs; no reloading supplies at all. So I've been getting my corn cob from vendors on Amazon. Generally the bulk product in the 1 cu ft box.
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Offline George16

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Re: What are merits of different grain size tumbling media?
« Reply #4 on: July 07, 2020, 08:58:47 PM »
I get my corn cob fromZoro.com. It’s $33 for a bag of 40lb.

https://www.zoro.com/zoro-select-blast-media-corn-cob-20-to-40-grit-crn3-40/i/G2165387/

Offline Clint007

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Re: What are merits of different grain size tumbling media?
« Reply #5 on: July 10, 2020, 04:28:56 PM »
Thanks to all

C
Temere phrase latine usus sum ut magna canetis

Offline bang bang

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Re: What are merits of different grain size tumbling media?
« Reply #6 on: July 10, 2020, 11:24:19 PM »
welcome

just some comments...

 > walnut is for cleaning

 > corncob for polish.

you can use the walnut for polishing but it wont be as pretty as corncob.  also corncob will breakdown sooner/faster, so get used to it.  And as you found out its dusty.  You can add a polish compound to the corncob and that will help cut down on the dust but it will happen.  Ive always used corncob as is.

Something you can try is to cut a small piece 2x2 inch of antistatic dryer sheet and put it in with your media.  It will help cut down on the dust.  But you may end up using it alot.  I would just add 1 piece and see how it works.  You can try to add another too if you want.

Fwiw, your cases WILL TARNISH overtime!   

If you want to try and get the dust out of your cases, get the dillon case separator (or make your own) and use that to dump your cases in.  Then once most/all of the media is out, use your CDA to blow out the dust.  Noting that by using your CDA it may create static electricity. 

Im not sure of your endgame for your cases?  but depending on what it is, you maybe making more work for yourself.

good luck




DJK11

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Re: What are merits of different grain size tumbling media?
« Reply #7 on: July 11, 2020, 07:03:33 AM »
I wet tumble and polished with corn cob and walnut media all my brass. I don’t get the tarnished and water spots since my house has a whole house water softener. I also use 20-40 grit corn cob and put strips of fabric softener to minimize the dust.

So the cats out of the bag, so to speak.  That’s how your for sale brass is sooo clean and shiny.

Offline George16

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Re: What are merits of different grain size tumbling media?
« Reply #8 on: July 11, 2020, 10:10:40 AM »
I wet tumble and polished with corn cob and walnut media all my brass. I don’t get the tarnished and water spots since my house has a whole house water softener. I also use 20-40 grit corn cob and put strips of fabric softener to minimize the dust.

So the cats out of the bag, so to speak.  That’s how your for sale brass is sooo clean and shiny.

Yes sir! I don’t mind sharing my secrets to my CZ friends😎.

Offline Dan_69GTX

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Re: What are merits of different grain size tumbling media?
« Reply #9 on: July 14, 2020, 09:05:46 AM »
....use your CDA to blow out the dust.....

What is CDA?   I hope it isn't Compressed Dust Applicator!  I wanna get rid of dust.   :o
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Offline recoilguy

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Re: What are merits of different grain size tumbling media?
« Reply #10 on: July 14, 2020, 12:46:38 PM »
Been trying to find a good corn cob supply .....tried the kitty liter scented corn cob
hate the stuff gave it to my neighbor with cats.

RCG
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What's hard is to be free in a communist country

Offline George16

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Re: What are merits of different grain size tumbling media?
« Reply #11 on: July 14, 2020, 12:56:29 PM »
Been trying to find a good corn cob supply .....tried the kitty liter scented corn cob
hate the stuff gave it to my neighbor with cats.

RCG

Check out the link in my previous post. I buy mine from Zoro.com.

Offline Dan_69GTX

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Re: What are merits of different grain size tumbling media?
« Reply #12 on: July 14, 2020, 01:19:48 PM »
Been trying to find a good corn cob supply .....tried the kitty liter scented corn cob
hate the stuff gave it to my neighbor with cats.

RCG

And they also sell walnut media
Some trust in chassis, Some in Horsepower, But we trust in the Lord our God.

If it goes "boom" or "vroom" I'm intersted.

Offline recoilguy

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Re: What are merits of different grain size tumbling media?
« Reply #13 on: July 14, 2020, 01:54:26 PM »
Been trying to find a good corn cob supply .....tried the kitty liter scented corn cob
hate the stuff gave it to my neighbor with cats.

RCG

Check out the link in my previous post. I buy mine from Zoro.com.

Thanks as a matter of fact the real reason I responded was so I could look up your link later and buy teh product!
Appreciate it!

RCG
Its easy being a communist in a free country
What's hard is to be free in a communist country

Offline DesertRatR

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Re: What are merits of different grain size tumbling media?
« Reply #14 on: July 18, 2020, 09:45:03 PM »
I use Lyman corn cob media (green stuff) with a bit of Nu-Finish in a Frankford Arsenal tumbler I've had for years. I find media cheap at Sportsman's Warehouse. I typically tumble 150 rounds (maybe more depending upon the match). I'll tumble for around hour and a half, longer if I forget. I'll add a bit of polish from time to time (no set schedule, just when the media seems dry ... learned to not add polish when brass is in the media). When the brass seems to not be as shiny after tumbling I'll replace the media. I've never tried walnut shell. But then again I don't pick up range brass and the corn cob seems to work for me.

I always tumble with the primers in and then store the cleaned brass. I notice some folks decap and then tumble. Why?