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Old January 6, 2014, 06:30 PM   #1
REDBULL600
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Ok, another .223 vs 5.56 question

New to the Black Rifle Disease and there fore new to this ammo.



So my wife is always alittle when she runs into Target to get something and when she comes back to the truck I am walking out of Dicks next door with a bag of Ammo, usually .223 or 30-30. I get lucky from time to time and they have 5.56 20rds for $5 but only a 3 box limit (then she really gets cause I make her come back with me to buy more) Once I found , hiding behind some 12 gauge target ammo, a 150 rd box of .223 there for $69 and I had a get $10 off $50 coupon .

But anyway, so now I have her looking for Ammo when she is at Dicks/walmart/Bass Pro and Cabelas. However she has been buying me the 5.56 ammo online cause she sees it is very cheap. I once told her I don't want to spend more then $0.50 a round so she started finding 5.56 for less then $0.43

My rifle is chambered in 5.56 so I am not worried about shooting this ammo, but do I want to be? Shooting a lot of 5.56 in general that is? I am slowly approaching a point where I'll have more 5.56 then .223. Is this a good thing or bad? I don't want to discourage my wife from buying and the 5.56 is at price point that she can approve of.
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Old January 6, 2014, 06:33 PM   #2
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If chambered in 5.56 then shoot to your hearts content.
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Old January 6, 2014, 07:37 PM   #3
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You're worried about shooting the round your rifle is chambered for?
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Old January 6, 2014, 08:12 PM   #4
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$0.36 / round at... oh, wait.... it's .223 and you have a 5.56, never mind.
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Old January 7, 2014, 10:00 PM   #5
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Buy what's cheapest if you have a 5.56 chamber. They are functionally the same, but two different standards for defining the dimensions and pressure ratings of the round. 5.56 is NATO's definition and .223 is SAAMI's definition. Although they come out to functionally the same cartridge, there are minute differences. These differences COULD result in an issue shooting 5.56 ammo out of a .223 chamber. I suspect you would be fine 99 times of a hundred, but a .223 chamber cut and headspaced tight might would be and issue firing 5.56. Either way, a 5.56 chamber is safe for either 5.56 or .223 so you're good no matter what... so buy the cheapest you can find!

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Old January 7, 2014, 10:35 PM   #6
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No problem just shoot either, both will work without problems.

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Old January 7, 2014, 11:00 PM   #7
sirgilligan
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Quote:
I am slowly approaching a point where I'll have more 5.56 then .223. Is this a good thing or bad? I don't want to discourage my wife from buying and the 5.56 is at price point that she can approve of.
For your rifle that is chambered in 5.56 NATO then it doesn't matter. If you add another rifle to your collection and it is .223 REM then it might matter that a lot of your ammo is not for your new rifle.

Most of my ammo is 5.56x45. Even the X-TAP I get is usually 5.56.

From my reloading tables:

5.56 takes up to 26.2 grains for the 62 grain M855.
.223 Rem take up to 25.0 grains for the 62 grain M855.

In other words, 5.56 is hotter than .223. That is why you don't shoot 5.56 in a .223 but you can shoot .223 in a 5.56.
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Old January 8, 2014, 01:12 AM   #8
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OP Your GTG

Quote:
From my reloading tables:

5.56 takes up to 26.2 grains for the 62 grain M855.
.223 Rem take up to 25.0 grains for the 62 grain M855.

In other words, 5.56 is hotter than .223.
From my Sierra book

69gr bullet = max loads
(AR-15) page 221 H335 23.8gr / 223 bolt action page 231 H335 25.7gr

IMR 4198 - AR 20.3gr / 223 bolt 20.0gr

Win 748 - AR 25.8gr / 223 bolt 26.1gr

Varget - AR 26.1gr / 223 bolt 26.4gr

N140 - AR 25.1 / 223 bolt 26.4gr

I'm not saying , I'm just sayin

Maybe factory NATO rounds are loaded hotter but when it comes to reloading for them . They seem pretty much the same with the 223 being hotter loads with some powders
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Old January 8, 2014, 03:14 PM   #9
REDBULL600
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I guess I am not explaining very well my concern.

If I am training all day shooting 500-1500 rds, am I going to wish I was shooting .223 ammo over the 5.56 ammo? or will it not matter and I won't notice? Most of all my ammo is 55 gr. Or is the grains what I need to watch and keep it low.

Again I am really new to the rifle. I got it just before it got Artic cold around here and I have only put about 15 rds of .223 through it.

I am saving up ammo for some Rifle courses this summer. I am big guy so should not worry about and shoot away?
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Old January 8, 2014, 03:27 PM   #10
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It won't matter and you won't notice.
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Old January 8, 2014, 04:14 PM   #11
Willie Lowman
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Quote:
It won't matter and you won't notice.
This.

Your DD was designed and built to fire 5.56mm ammo. As a shooter, you will likely not notice any difference in recoil or report from 5.56 and .223. You most likely won't notice much difference in POA/POI at 100 yards.

To repeat

Don't. Worry. About. It. Go shoot your very nice rifle. Enjoy!
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Old January 8, 2014, 04:25 PM   #12
DannyB1954
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My reload manual shows the same dimensions and angles for both rounds, so I think it mostly a matter of pressure. If your rifle is rated for the higher pressure, there should be no problem.
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Old January 8, 2014, 04:43 PM   #13
Metal god
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Ok that is more helpful .

I agree with the others that is does not matter-ish

Everything starts to matter at longer ranges 300+ yards . If just plinking for 25 to 100yds Your GTG .

What I do with most of my firearms is zero them/it to a specific round/load and note how the rifle is adjusted ( sights ) for that load . That load is almost always the best shooting load for the rifle or the SD/HD round I intend to use . Now when shooting other ammo that may have a different POI ( point of impact ) then the zeroed load . you can adjust the sights to be dead on with what ever ammo you use and be able to adjust back to your true zero for your target or SD/HD loads . The term used most often is (doping) your rifle . Keep a log of where your sights need to be adjusted for each ammo you shoot , While always having that one true zero for the best ammo the firearm shoots .
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Old January 8, 2014, 04:59 PM   #14
REDBULL600
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Metal God, good to note. I Zeroed with .223 62gr. and all my 5.56 is 55gr. I'll work on that when the ground thaws However I am very eager to try out my new Target stand; http://www.laststands.com/
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Old January 8, 2014, 09:07 PM   #15
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FWIW . The one true zero could be the ammo you shoot the most . Meaning : if you shoot cheap plinking ammo 99% of the time . Even though that's not likely the best shooting ammo for the firearm . The fact you shoot it so much , it might as well be the true zero of the firearm .
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Old January 12, 2014, 11:19 AM   #16
sirgilligan
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Quote:

OP Your GTG

Quote:
From my reloading tables:

5.56 takes up to 26.2 grains for the 62 grain M855.
.223 Rem take up to 25.0 grains for the 62 grain M855.

In other words, 5.56 is hotter than .223.
From my Sierra book

69gr bullet = max loads
(AR-15) page 221 H335 23.8gr / 223 bolt action page 231 H335 25.7gr

IMR 4198 - AR 20.3gr / 223 bolt 20.0gr

Win 748 - AR 25.8gr / 223 bolt 26.1gr

Varget - AR 26.1gr / 223 bolt 26.4gr

N140 - AR 25.1 / 223 bolt 26.4gr

I'm not saying , I'm just sayin

Maybe factory NATO rounds are loaded hotter but when it comes to reloading for them . They seem pretty much the same with the 223 being hotter loads with some powders
The load data I posted is Ram Shot TAC. There is a difference. I should have been clearer, that I was talking about one specific powder. Apple to apple comparison so to speak.


Code:
Cart       Gr Make Type Start Vel Max Vel Pressure COL
-------------------------------------------------------------------
.223 REM   62 MIL M855 22.5 2,800 25.0 3,066 54,947 2.260
5.56 NATO  62 MIL M855 23.6 2,940 26.2 3,219 62,350 2.260
Now, if someone is about to make this load, double check that I didn't type something in wrong. Don't be silly.


p.s. My Hornady reloading book lists .223 Remington and .223 Remington Service Rifle as two different cartridges. However there is overlap on the bullet weight. The .223 Rem ends with 60 gr bullets and the .223 Rem Service Rifle starts with 68 gr bullets. Maybe I need a new Hornady book.

My Speer manual doesn't have anything listed but .223 Rem.

Ultimately, its all about the pressure.
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Old January 12, 2014, 12:18 PM   #17
Metal god
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My Hornady 9th edition has 223 Remington pg 147 , 223 Remington service rifle pg 154 and 5.56 NATO pg 157

There is not a lot of cross over powders between the 223 remington and the 5.56 NATO in the book . Below is powders that are listed in both using 55gr bullets . These will all be there max loads , DO NOT USE AS A STARTING POINT

223 Remington pg 152

IMR 8208 xbr - 25.8gr
BL-C 2 - 28.1gr
CFE 223 - 27.4gr

5.56 NATO pg 158

IMR 8208 xbr - 24.5gr
BL-C 2 - 27.5gr
CFE 223 - 27.5gr
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