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Old April 13, 2013, 08:45 PM   #1
flintlock.50
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What is the color change on the case?

I'm new to ARs. I notice that the top ⅓ of the 5.56mm cases I've used are a different color than the lower ⅔. I just found some Speer Lawman 5.56mm ammo and they, too, show the color change. I'm guessing it's a heat treatment of some sort, but I'm no metallurgist. Can someone explain the color difference, please? Why don't .223 shells have the same?

I'm assuming these cases can be reloaded without issue. Yes, I know I'll have to remove the crimped primers. That will be my next question. There seem to be MANY different opinions and techniques for removing the crimp.

Thanks
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Old April 13, 2013, 08:55 PM   #2
Mike38
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The discoloration you see is called annealing. Yes, it’s heat treating to make the brass softer.
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Old April 13, 2013, 09:25 PM   #3
flintlock.50
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I'm familiar with annealing. So why anneal 5.56 mm but not .223?
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Old April 14, 2013, 08:01 AM   #4
madcratebuilder
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Quote:
So why anneal 5.56 mm but not .223?
Mil-spec.
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Old April 14, 2013, 09:07 AM   #5
BillyJack3
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Just depends on the ammo you get. Some polish it up and make it pretty, some don't.
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Old April 16, 2013, 02:27 PM   #6
blfuller
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All of it is annealed. It's just the military grade ammo doesn't get that discoloration polished off like the commercial ammo.
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Old April 16, 2013, 07:39 PM   #7
flintlock.50
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Thanks for the replies. That's what I wanted to know.
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Old April 17, 2013, 07:32 PM   #8
Palmetto-Pride
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Quote:
I'm assuming these cases can be reloaded without issue. Yes, I know I'll have to remove the crimped primers. That will be my next question. There seem to be MANY different opinions and techniques for removing the crimp.
They can be reloaded thats what I use to make 300 BLK brass. This is what I use to remove the primer crimp.......http://www.lymanproducts.com/lyman/c...ket-reamer.php

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Old April 18, 2013, 06:34 AM   #9
stubbicatt
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Dillon Super Swage is another tool you might want to consider. Having tried the other forms of removing primer crimps, I have settled on this one.
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Old April 18, 2013, 09:26 AM   #10
Ben Dover
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In my experience, ther Dillon super Swage is a marvelous tool.

A but pricey, perhaps, but well worth every penny.

I conce swaged the pockets of 5,000 9MM cases in two evenings.
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Old April 18, 2013, 11:27 PM   #11
James K
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Military spec requires that the annealing color be left on so the inspectors can be sure that the annealing step was not skipped. And also because it speeds production when the polishing is not done.

Jim
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