.223 for bear, mountain goat, deer, elk, and moose.

[Pharmseller]

Tikka's rifles are proofed to the CIP (Long French acronym for Permanent International Commission for the Proof of Small Arms). The CIP max pressure for the .223 Remington is 4300 bar, while the SAAMI max pressure is 3800 bar. The NATO standard for 5.56 is 4300 bar. The U.S. military follows SAAMI pressure guidelines. That's basically a long way of saying that a Tikka .223 barrel is proofed at 5.56 NATO pressures.

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Too much TAC with a 75 ELDM in hot conditions will change the way you look at the world.



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[Anschutz]

Too much TAC with a 75 ELDM in hot conditions will change the way you look at the world.



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I guess it's a good thing he was asking about BH factory ammo, which is likely not near max pressure to account for changes in temperature.

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[Chris_in_Idaho]

The NATO standard for 5.56 is 4300 bar. The U.S. military follows SAAMI pressure guidelines. That's basically a long way of saying that a Tikka .223 barrel is proofed at 5.56 NATO pressures.

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Is that 4300 bar standard for 5.56 assuming the 5.56 ammo is being fired from a 5.56 chamber with the long sloppy freebore?

Firing the same 5.56 ammo in a standard 223 Remington chamber causes even higher than typical "5.56 pressure" because the bullet can no longer make the easy initial jump to hit the rifling.

This is why chambers with a gradual lead such as 223 Wylde came to be. To try to maintain some of the precision of the 223 chambering without causing the pressure spike.

In this case I have read elsewhere that a Tikka has a chamber similar to a Wylde and it can legitimately use 5.56 ammo without exceeding allowable pressure.

But in general, comparing the stated pressure of 5.56 ammo against the allowable pressure of a 223 rifle is faulty logic because "5.56 pressure" is only true from a 5.56 chamber.

Sorry, soapbox rant complete...

On that, now that Finland became a NATO member 8 months ago, do you think Tikka will begin marking their rifles with "5.56 NATO"?

 

[Anschutz]

Is that 4300 bar standard for 5.56 assuming the 5.56 ammo is being fired from a 5.56 chamber with the long sloppy freebore?

Firing the same 5.56 ammo in a standard 223 Remington chamber causes even higher than typical "5.56 pressure" because the bullet can no longer make the easy initial jump to hit the rifling.

This is why chambers with a gradual lead such as 223 Wylde came to be. To try to maintain some of the precision of the 223 chambering without causing the pressure spike.

In this case I have read elsewhere that a Tikka has a chamber similar to a Wylde and it can legitimately use 5.56 ammo without exceeding allowable pressure.

But in general, comparing the stated pressure of 5.56 ammo against the allowable pressure of a 223 rifle is faulty logic because "5.56 pressure" is only true from a 5.56 chamber.

Sorry, soapbox rant complete...

On that, now that Finland became a NATO member 8 months ago, do you think Tikka will begin marking their rifles with "5.56 NATO"?

You are correct. I did miss that throat piece. It shouldn't be a factor with factory loads because manufacturers are loading under the max, but I wouldn't take the max load some yahoo on the internet came up with on their 5.56. That'd be unsafe loading practice to begin with, though.

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[xsn10s]

Starline does make a note of the difference in pressures between their .223 rem brass and 5.56 brass. https://www.starlinebrass.com/556x45mm-brass

 

[Pharmseller]

I guess it's a good thing he was asking about BH factory ammo, which is likely not near max pressure to account for changes in temperature.

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My statement holds true regardless of the original question.








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[xsn10s]

Am I seeing that some guys are shooting the black hill 556 77 gr ammo in their Tikka 223 rifles? If so, any pressure issues? Always read that was a 'no no'.

If anything happens the first thing any manufacturer is going to ask is "What ammo and do you have the case that failed.". Once that is established it's easy to say that 5.56 is not approved for .223 Remington chambers due to chamber pressure.

 

[flyinsquirel]

@Pharmseller - If you mentioned it before I missed it; but would you mind telling us how much TAC and what temps caused that? I’m currently using TAC behind a 77SMK at 2720. Haven’t seen any issues on hot days yet, but definitely not looking to find out.

 

[wirehead]

Add one to the list.

.223 62 grain federal fusion MSR

95 yards. Neck shot (not on purpose but not by accident - long story).

DRT

Just turned 10 and her first deer / first buck. Happy kido. Proud papa.

 

[sierracharlie338]

Add one to the list.

.223 62 grain federal fusion MSR

95 yards. Neck shot (not on purpose but not by accident - long story).

DRT

Just turned 10 and her first deer / first buck. Happy kido. Proud papa.

That’s awesome congrats to you both!!

 

[Drenalin]

Saw 4 more shot with the 73 ELD-M today. Two of them ran a little less than a hundred yards, the others dropped. Internal damage was in line with what I’ve seen consistently this year. Got one exit, which was extremely dramatic. Shots were at 30 yards, 196 yards, 212 yards, and 294 yards. No pics this time.

Edit to add: these were all whitetails.

 

[Pharmseller]

@Pharmseller - If you mentioned it before I missed it; but would you mind telling us how much TAC and what temps caused that? I’m currently using TAC behind a 77SMK at 2720. Haven’t seen any issues on hot days yet, but definitely not looking to find out.

Well, let’s just say it was a lot, like more than Ramshot’s max for 5.56, and it was over 80 F.

Edit to add, it’s the only only only time I’ve exceeded book max.



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[Anschutz]

Well, let’s just say it was a lot, like more than Ramshot’s max for 5.56, and it was over 80 F.




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That doesn't sound like a TAC, Tikka, or temp problem.

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[Pharmseller]

That doesn't sound like a TAC, Tikka, or temp problem.

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It worked at 55 F.

But yeah, bonehead move on my part.




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[z987k]

No, I wouldn’t use those unless forced. DRT Technology makes a powdered tungsten cored bullet that behaves more like a Berger. The 79gr .224 and 135gr 6.5mm seem to do well.

The 62gr works pretty well for the guys that don't have the twist for the 79. The BC to speed tradeoff actually works in the 62gr's favor past where anyone's shooting an animal with a 223.

 

[ORJoe]

It sucks they don’t, it’s one to many rounds for hunting in Oregon.

Oregon's 5 round limit is for semi-auto only. No limit on bolt or lever gun capacities.

 

[Nomosendero]

Starline does make a note of the difference in pressures between their .223 rem brass and 5.56 brass. https://www.starlinebrass.com/556x45mm-brass

Likely a loss of case capacity will result, does anyone know?

 

[clperry]

Data point. Wife’s deer.
223 yards
77 TMK
Impact velocity 2185 fps
Pass through
40 yard run
Right side is entry

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[Chris_in_Idaho]

Very nice!

 

[SNelson]

Data point. Wife’s deer.
223 yards
77 TMK
Impact velocity 2185 fps
Pass through
40 yard run
Right side is entry

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Did you make her wait until it was exactly 223 yards away?!?