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Old 06-22-2013, 05:34 AM   #1
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Default .223/5.56 reloading question

If I run 5.56 brass through a .223 die, does it change the brass to .223 so that it would be safe to use in a .223 only gun, or is it still 5.56?

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Old 06-22-2013, 06:02 AM   #2
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The dimensional differences are minute. These are corrected by resizing in a .223 sizer die. You will likely find 5.56 brass to be significantly over length after resizing. Most are longer than .223 specs when unfired.

The main difference in the ammo si the pressures to which each are loaded. I have loaded and fired many thousands of rounds of 5.56 brass resized in .223 dies. Just measure and trim.

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Old 06-22-2013, 11:00 AM   #3
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Trimming won't be a problem. Thanks.

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Old 06-22-2013, 12:14 PM   #4
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Quote:
Originally Posted by texaswoodworker View Post
If I run 5.56 brass through a .223 die, does it change the brass to .223 so that it would be safe to use in a .223 only gun, or is it still 5.56?
Yes, case dimensions are the same, so running your brass through your 223 die will allow you to use it in a 223 only gun. It will also allow you to use it in a 5.56 chambered gun. There is no such thing as a 5.56 die, they are all 223.
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Old 06-22-2013, 12:31 PM   #5
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The difference is in the throat of the rifle. Use 223 bullets and seating loading data for such and trim to length and its a non issue.

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Old 06-22-2013, 06:33 PM   #6
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No problems - been doing it for some time in my Lee dies for my 5.56mm chambered SA vz-58.

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Old 06-23-2013, 11:48 AM   #7
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5.56 and 223 are the same thing. size,trim, prime, and seat the same. The only difference is in the manuals, they say to reduce loads by 10% in military cases.

That is because the cases are a little thicker, on the inside of the case.

Me personally i don't reduce my loads, and have had 0 problems. I load for 5.56/223 in AR, bolt, and single shot rifles. Same load, same bullet, same primer, same powder charge, with mixed commerical and military brass.

Load and go.

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Old 06-23-2013, 01:55 PM   #8
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Originally Posted by farmallcrew View Post
5.56 and 223 are the same thing. size,trim, prime, and seat the same. The only difference is in the manuals, they say to reduce loads by 10% in military cases.

That is because the cases are a little thicker, on the inside of the case.

Me personally i don't reduce my loads, and have had 0 problems. I load for 5.56/223 in AR, bolt, and single shot rifles. Same load, same bullet, same primer, same powder charge, with mixed commerical and military brass.

Load and go.
Although this is true for Military 308 and 30-06 cases it is less true for the 223/5.56. In fact most Military 5.56 cases have More case capacity than civilian 223 cases.

This is from Sierra #5 Manual.
The conventional wisdom to reduce loads with military brass is familiar to most reloaders and is generally good advice. The rationale here is that the military cases tend to be somewhat thicker and heavier than their civilian counterparts, which in turn reduces capacity and raises pressures. This additional pressure normally requires a one or two grain reduction from the loads shown in most manuals or other data developed with commercial cases. While this is most often the situation with both 308 Winchester and 30-06 cases, it is less true with the 223 brass. We have found that military cases often have significantly more capacity than several brands of commercial brass. Again, take the time to do a side-by-side comparison of the cases you are working with and adjust your load as needed. There may be no need for such a reduction with the 223. Know your components and keep them segregated accordingly.


Here is more. Scroll down to the "223 Rem Case Weight vs Capacity" chart. Note the Military cases carry the highest case capacity.

http://www.6mmbr.com/223rem.html
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Old 06-23-2013, 05:12 PM   #9
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i concur with farmall

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Old 06-24-2013, 06:23 PM   #10
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i concur with farmall
From Ramshots Web Site.

Case volume does affect the internal ballistics, and a smaller volume will produce higher pressures and velocities, and vice versa for a larger volume at any given chargemass. However, it depends what the real difference in volume is.In the case of rifle calibers, this question are most often asked when cases are compared in the two popular calibers which are also “military” calibers i.e. 223Remington/5.56mmNATO and the 308Win/7.62x51NATO.

Instead of assuming that military brass always has smaller volume, we strongly suggest that a simple volume measurement be done by filling both (or more) cases with water (preferably distilled water) and to weigh the water.

Then reduce or increase the load by the same proportion (%).

Although it can be indication, do not go by the weight of the cases.

From our recent experience the latest generation 5.56mmx45 cases have close to/or similar volumes than commercial cases. In the early years of the 5.56mmx45 ca early 1960’s, some cases were smaller in volume; however those cases have mostly been purged form the market.

In the case of 7.62×51 we have found that “MIL” cases are between 3 to 4% smaller in volume requiring a reduction in chargemass as published in our loadguides.

Please keep in mind that this applies to all calibers and when cases of different manufacturers are used we strongly recommend determining the volume with water.


Link
http://www.ramshot.com/faq/
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