5.56 ammo in a .223 tikka

[eddielasvegas]

Makes excellent sense to me. Thanks all.


Eddie

 

[cuerro viejo]

never had an issue in my ars running 5.56 in them before they stopped us to use them and now only safe queens. the same for tavors.

No idea, I’ve never had a 223 AR, always being 556, but bolts always 223. All the “blow up photos” all looked to be AR’s. Who knows, I run the hell out of stand1, ASC, Blk Hills 556 in tikka 223 though

 

[CC55]

I've shot a bunch of AAC TMK without issue in my Tikka 223. Probably the most accurate stuff out of the rifle.

 

[medvedyt]

No idea, I’ve never had a 223 AR, always being 556, but bolts always 223. All the “blow up photos” all looked to be AR’s. Who knows, I run the hell out of stand1, ASC, Blk Hills 556 in tikka 223 though

ah ah fair enough but of course in canada we were different and as a civilian version they will not put 5.56 on them ...

 

[The Guide]

ah ah fair enough but of course in canada we were different and as a civilian version they will not put 5.56 on them ...

Hence the 223 Wylde chambers...

Jay

 

[Schmo]

Id say so. The mini 14 action was built specifically for the .223 vs the tikka t3 being built for every centerfire chambering they ever planned to offer.

An action isnt just rated for a certain pressure, it has to handle the resulting stresses which are somewhat cartridge geometry derrived.It isnt that simple though. Cutting a .223 chamber in a barrel means its a .223 barrel which is explicitly not compatible with 5.56 ammo. 5.56 is going to make its design pressure in a 5.56 chamber. I think .223 has a shorter freebore, which could compound with the already higher pressure of a 5.56 and make it worse, and probably exceed the design pressure of the .223 rifle.

I doubt anyone has blown up a good .223 rifle with in spec 5.56 ammo but I bet someone's pierced a primer or stuck a case or something.

I would say this is highly unlikely, since factory 5.56 is still loaded to the same COAL as .223.

 

[wind gypsy]

I've shot AAC and probably some other 556 in a factory 223 lite. No big concerns but bolt lift got sticky on some of them so I wasn't a big fan of it.

IIRC tikka actions are proofed to CIP standards, and the CIP pressure rating for .223 rem is 62,366psi which is the same as the SAAMI pressure rating for 5.56 Nato.

The catch is a given round is going to make more pressure in a SAAMI 223 chamber than it is in a 556 chamber.

 

[wind gypsy]

I would say this is highly unlikely, since factory 5.56 is still loaded to the same COAL as .223.

COAL is to fit in a standard magazine. They load them to different pressures and those pressures are based upon a certain chamber spec. 556 is loaded to higher pressures based upon a 556 chamber. A 556 or 223 round will make more pressure in a 223 chamber than it will in a 556 chamber.

556 in 223 chamber - most pressure
556 in 556 chamber - next most pressure
223 in 223 chamber - next least pressure
223 in 556 chamber - least pressure

 

[NWBLKTAIL]

I've shot AAC and probably some other 556 in a factory 223 lite. No big concerns but bolt lift got sticky on some of them so I wasn't a big fan of it.

This must be why you went with a Wylde chamber to mitigate the issue? I thought I saw you post you got a one spun on

 

[waspocrew]

No issues here firing 5.56 in my 223 Tikka CTR. Lots of AAC, Black Hills, etc.

 

[mtnbiker208]

How do you guys feel about shooting 5.56 in a 223 ruger #1?

thanks
tim

 

[Q_Sertorius]

How do you guys feel about shooting 5.56 in a 223 ruger #1?

thanks
tim

I would do it in a heartbeat. The only Ruger No. 1 I have ever used is in 9.3x74R. That’s a very strong action.

Many years ago, I went to a trusted Gunsmith asking him if I should rechamber a rifle from .223 to 5.56. He looked at me like I had three heads. Then smiled and said something to the effect of… “******* lawyers and idiots ruin everything. A couple of idiots manage to somehow blow up a rifle and the manufacturers’ lawyers all freak out. I won’t take your money. Let me see the rifle.” After looking it over, he told me to go forth and do good things.

Your mileage may vary, but to me, in a well-maintained rifle, using military surplus 5.56 in a .223 is just like using military surplus 7.62x51 in a .308. I know that’s not technically true, but I have never worried about it since the conversation above.


____________________
“Keep on keepin’ on…”

 

[Shortschaf]

How do you guys feel about shooting 5.56 in a 223 ruger #1?

thanks
tim

You could probably fire 50MBG in a 223 chamber on a ruger #1 without issue!

If I am not mistaken, the same falling block action is used on all of them. From 458 Lott all the way down to 204 Ruger.

It should handle 5.56 in a marginally different chamber with ease

 

[wind gypsy]

This must be why you went with a Wylde chamber to mitigate the issue? I thought I saw you post you got a one spun on

Mostly just because it allowed me to load longer and get a faster twist barrel but that is another benefit. I think this tube builds pressure just as fast as the factory tube with a 223 chamber though.. I'd assume thats a bore difference not chamber but certainly possible tikka factory chamber is a little looser than a min spec wylde in places. Haven't shot any 556 in it because i have cases of factory 223 and plenty of handloads.