5.56 in .223?

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5.56 in .223?

Post by tofu » 01 Aug 2018, 6:47 pm

I know the general rule of thumb is .223 is ok in 5.56 but not the other way around but i was wondering whether this round would be ok in a remington 700 sps 223

http://www.hornadyle.com/products/rifle ... ap-barrier

i have been using

http://www.hornadyle.com/products/rifle ... -tap-urban
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Re: 5.56 in .223?

Post by No1Mk3 » 01 Aug 2018, 8:06 pm

G'day tofu,
The ad itself is quite clear on this point, take the manufacturers word on this, not the internets. Do not use in 223Rem chambered rifles, Cheers.
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Re: 5.56 in .223?

Post by tofu » 02 Aug 2018, 6:22 am

Yeah i get that and i know the reason why you dont is because of the extra pressure nato rounds produce but what produces that extra pressure? The 2 more grains of powder?

The dimensions are the same except for the projectile. The only difference is the 223 is 60 gr and 5.56 is 62 gr
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Re: 5.56 in .223?

Post by TheDude » 02 Aug 2018, 6:45 am

Case thickness and different chamber throat (length and angle) account for the pressure differences.

If you want to shoot 5.56, get a rifle chambered in it or go 223 wylde
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Re: 5.56 in .223?

Post by straightshooter » 02 Aug 2018, 7:04 am

Adding to what 'TheDude' has said.
All factory chambered 223 rifles should be chambered to SAAMI or CIP specifications. In that event the likely pressure increase due to using military specification 556 ammunition will be insignificant.
The problem will arise when you have a so called 'match' or 'target' chamber. Then the cumulative effects of repeated high or over pressure rounds may have serious consequences even though signs of excess pressure may not be apparent on fired rounds.
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Re: 5.56 in .223?

Post by tofu » 02 Aug 2018, 8:35 am

righto. cheers everyone.
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Re: 5.56 in .223?

Post by sungazer » 02 Aug 2018, 9:29 am

Personally from what I have read and know about the modern 223. I don't believe that there would be any issues. The 223 today is chambered to take much longer rounds ie projectiles the throat is not only made to take these longer projectiles but then they add another safety gap to reduce any chance of over pressure. The modern guns are also manufactured using components that are rated to the 60,000 psi and then proof tested at well above this. For the case of European guns manufactured to CIP standards it is 125% of the 60,000.
Compare a round set to you longest chamber length against a 5.56 round it will be miles longer.
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Re: 5.56 in .223?

Post by tofu » 02 Aug 2018, 11:31 am

this is why i was asking. i have both rounds and all dimensions, except for projectile, are the same.

i've sent hornady a message anyway to see what they say.
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Re: 5.56 in .223?

Post by sungazer » 02 Aug 2018, 3:12 pm

If you have to ask you will get the answer from Hornady that will protect them from any liable. You will get the same answer that is written on the packaging you have shown. Just for clarification are you talking about just the projectiles or the loaded ammunition. Although in my view it makes no difference. But if you are just talking about can I handload this projectile? Then the answer is even more straight forward and is a resounding Yes and you can load them to any pressure you want.
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Re: 5.56 in .223?

Post by tofu » 02 Aug 2018, 4:21 pm

yeah, i'll most likely get the same answer as on the box but i'll ask anyway.

to answer your question, what im wondering is if it will work (and not cause any damage) using the 5.56 round in my 223 rifle seeing as all things measure the same except
1. the 223 projectile is longer
2. 223 round is 60gr and 5.56 round is 62gr

everything else measures the same.

if i can't use it then i'll be pulling apart and reloading 223 rounds.
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Re: 5.56 in .223?

Post by sungazer » 02 Aug 2018, 4:26 pm

When you say a 223 is 60grn and the 5,56 is 62 gr. There are 223 rounds that go up to over 80grn. They are much longer than any 62 grn. They do however require a 1-8 twist to get them to shoot well. With a 1-9 twist using the right projectile you can get up to about 75 grn.

When you look at the MV of each round you are talking about in a comparable barrel take the 20 inch bushmaster for instance there is 70 fps difference. That again shows there is very little difference between the two. Perhaps 1 grain of powder. So Is the 223 round loaded to absolute max? No Its not that hard to push a 62 gr projectile at 3037 fps in a 20 inch barrel.
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Re: 5.56 in .223?

Post by tofu » 02 Aug 2018, 4:46 pm

Thanks for the advice, much appreciated. Ill wait for hornady...most likely a no, then ill make up my mind what i do with these 400 5.56 rounds
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Re: 5.56 in .223?

Post by tofu » 03 Aug 2018, 6:50 am

this is what hornady has said.

One of the biggest differences also between the two is the projectile respectively. The affect of terminal performance depending on the intended use will be different. The 62gr barrier round will have more weight retention than the 60gr urban so it will have deeper penetration capabilities.


i guess since im just using this at the range, i'm not too concerned about the penetration side of things.
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Re: 5.56 in .223?

Post by MontyShooter » 03 Aug 2018, 7:29 am

Does anyone sell factory 5.56 in Australia?
I gave a rifle chambered in 223 wylde but I've never seen 5.56 ammo in a LGS.
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Re: 5.56 in .223?

Post by No1_49er » 03 Aug 2018, 9:43 pm

You may need to look for mil-surp for 5.56
The difference between 223 & 5.56 may be better explained with the attachments.
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2_AR-15-223-vs-556.jpg
2_AR-15-223-vs-556.jpg (284.49 KiB) Viewed 1402 times
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Re: 5.56 in .223?

Post by sungazer » 04 Aug 2018, 7:51 pm

No1_49er respectively that is a load of crap. It may have been the case at one time it certainly isn't the case now. I have loaded some of those SS109 steel insert high penetration rounds and when seated to the canular they are well over 100 thou off the lands. I seat them longer to get better accuracy. I also seat many other projectiles longer than what the COAL or OAL of that round in your picture.

Rather than a lot of people just regurgitate what has been posted on the internet. People should take the time to learn how their rifle is actually rated and what that rating is. They should find out what the chamber size is. Only then can you start to work out the facts from the fiction being pushed by herds of people all trying to be the big guy giving warnings.
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Re: 5.56 in .223?

Post by No1_49er » 04 Aug 2018, 11:51 pm

The information that I posted is freely available from ammunition manufacturers and Tool-Makers i.e. the people who actually make the chamber reamers for 223Rem and 5.56 NATO. If you care to check their drawings you will find that there is a difference in the throat. I didn't make this stuff up - go and check out the chamber reamer dimensions for yourself.
The differences are probably what prompted the Go/No Go chart for 223 vs 5.56 ammo.
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Re: 5.56 in .223?

Post by TheDude » 05 Aug 2018, 11:46 am

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