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December 30, 2010, 12:34 PM | #1 |
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Join Date: August 30, 2010
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What is "mesh size" for corncob media?
So I see I can get a 40 pound bag of corncob media from McMaster-Carr for about $25:
http://www.mcmaster.com/#corn-cob-ab...-media/=adh9ze But it comes in different "mesh sizes". I assume you'd want the smallest. But how do you interpret mesh sizes? Is bigger mesh size bigger or smaller particles? Steve |
December 30, 2010, 12:59 PM | #2 |
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I've seen all three sold for polishing. The coarse is too big and doesn't work well. Both the middle and fine grades will work. I prefer the fine to get more inside primer pockets, though I'm not sure it lasts as long as the 14-20. But that's a subjective impression and not measured in any way.
That stuff is sold for blasting paint off wood and other soft surfaces. You can often find it locally at a sand blasting supply outfit and save yourself the shipping.
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December 30, 2010, 01:57 PM | #3 |
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Media size pics http://www.greenproducts.com/corncob_products/ I've use the 1/8" size usually found in pet bedding,works great on 30 cal. and larger or straight wall pistol case and the 1014 as well for anything will smaller size necks like .223/5/56.
No matter which size you use your going to get some media stuck in the flash hole on occasion if you tumble with the primer out. I do a pre and post tumble on my brass before and after sizing,usually a few hundred cases at a time so it not a big deal to clean out a few pieces of media. |
December 30, 2010, 02:02 PM | #4 | |
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Quote:
Steve |
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December 30, 2010, 02:08 PM | #5 |
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Usually. That's another reason I didn't like the really big stuff. You can sometimes get a stuck kernel on the inside that is bigger than the flash hole, and which deflects the decapping pin to the side so it hits solid brass. Best to unbend a paperclip and poke those out manually from the primer pocket side. Doesn't take long and you need to inspect cases at some point anyway.
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December 30, 2010, 02:43 PM | #6 | |
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Quote:
And media still gets stuck in the flash hole even if the primer is in the case. It just gets punched out when you decap. |
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December 30, 2010, 07:44 PM | #7 |
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If you get the 20-40, they rarely catch in the flash hole, and never plug it. The 14-20 will catch more often and can fill the hole.
You can get a better price on the same bag from DrillSpot: http://www.drillspot.com/products/52...bs_blast_media |
December 30, 2010, 07:49 PM | #8 |
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Thanks for the link!
Steve |
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