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.223 or .556

This is a discussion on .223 or .556 within the Ruger Bolt Action forums, part of the Rifle & Shotgun Forum category; I have a Compact 77 in .223. I am very please with it. It shoots very well and it is easy to haul around all ...


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Old December 13th, 2011, 09:12 PM   #1
 
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.223 or .556

I have a Compact 77 in .223. I am very please with it. It shoots very well and it is easy to haul around all day. I also have a Mini-14 in .223. Ruger says the Mini can shoot both .223 and .556 interchangeably and although it shoots some ammo better than others, it likes both caliber designations.

My question is this. Is the chamber of the M77 .223 only, or can it digest both .223 and NATO stuff? It would be nice it it would do both just because of ammo prices. I can not find anything on the Ruger site, so I thought I would ask this knowledgeable forum before I called Ruger. Thanks



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Old December 14th, 2011, 12:53 AM   #2
 
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The only non AR -15 thats being manufactured and sold in America thats chambered for the 5.56 Nato is Mossenbergs MVP that I am aware of.

On a side note...in case you werent aware, there are some very subtle diferences in the 223 and the 5.56 Nato. While chambering both in a gun is easily achieved firing the 5.56 Nato in a gun Chambered for the 223 can result in elevated pressures that exceed SAAMI specifications. Will it blow your gun up sooner or later? Probably not, but your still walking on water chancing that the ice dont break.
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Old December 14th, 2011, 05:28 AM   #3
 
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Your Mini-14 can shoot both because its chambered for 5.56 Nato. They are considerably hotter than .223 loads and just as the last poster mentioned, SAAMI specifically warns against firing 5.56 in a .223 chamber.
I agree you probably will have no issues if you *did* shoot 5.56 in that bolt action, but you would be taking a measured risk that is not needed. plenty of good .223 hunting ammo out there.
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Old December 14th, 2011, 05:42 AM   #4
 
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Quote:
Originally Posted by Meeteetse View Post
I have a Compact 77 in .223. I am very please with it. It shoots very well and it is easy to haul around all day. I also have a Mini-14 in .223. Ruger says the Mini can shoot both .223 and .556 interchangeably and although it shoots some ammo better than others, it likes both caliber designations.

My question is this. Is the chamber of the M77 .223 only, or can it digest both .223 and NATO stuff? It would be nice it it would do both just because of ammo prices. I can not find anything on the Ruger site, so I thought I would ask this knowledgeable forum before I called Ruger. Thanks

Quote:
Originally Posted by Spring View Post
Your Mini-14 can shoot both because its chambered for 5.56 Nato. They are considerably hotter than .223 loads and just as the last poster mentioned, SAAMI specifically warns against firing 5.56 in a .223 chamber.
I agree you probably will have no issues if you *did* shoot 5.56 in that bolt action, but you would be taking a measured risk that is not needed. plenty of good .223 hunting ammo out there.
Quote:
Originally Posted by LunaticFringeInc View Post
On a side note...in case you werent aware, there are some very subtle diferences in the 223 and the 5.56 Nato. While chambering both in a gun is easily achieved firing the 5.56 Nato in a gun Chambered for the 223 can result in elevated pressures that exceed SAAMI specifications. Will it blow your gun up sooner or later? Probably not, but your still walking on water chancing that the ice dont break.
223 chambers have a sharper angle on the lead than 5.56, which means that 5.56 ammo(which is typically loaded hotter) can cause higher pressures in a TRUE 223REM chamber.

The Mini-14... like most ARs probably has a 223 wylde chamber... they took the 223 lead angle and made it more gradual, similar to the 5.56 but slightly steeper(nowhere near that of a true 223)... it will still be stamped "223 Rem" though.

This is why ARs are known to shoot both safely, and is probably the reason why Ruger said you can shoot both.


As far as your bolt gun goes... the 5.56 will not blow it up, but it can cause higher than normal pressures, I'd call Ruger and ask them about it... most bolt guns though are true 223Rem chambers from all I have read.

Mike.

The
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Old December 14th, 2011, 05:52 AM   #5
 
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my stepdad has been shooting 5.56 in his mini for probably 20 years now. no issues

kinda off topic, but M14 owners have the same thing going on with the 308/7.62, and SAI says both are safe in their guns. they took in account that owners of their guns would shoot .308s, which is a higher pressure round. the 7.62 chambered guns have "looser" headspacing to allow for a rifle to get dirty and keep on chugging.
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Old December 14th, 2011, 06:47 PM   #6
 
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I guess I did not phrase the question well.

I know the Mini-14 can handle both .223 and 5.56 and I have been shooting both in the Mini for over 30 years. My question was intended to ask if my M77 Compact boltgun in .223 has the same chamber as the Mini, or is my M77 really a .223 only?

I know the rule about shooting .223 in a 5.56 chamber but not vice versa for safety.
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