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

[brockel]

18” 22-250 77 tmk 180 yards quartering away. Bullet went behind shoulder and exited opposite shoulder. Buck ran 60 yards or so and tipped over.

 

[Chris_in_Idaho]

If your standard is "it fits and I didn't die," then yes.

If you want to be operating within the designed pressure, then it depends on the leade.

A 5.56 chamber has a long leade so the bullet gets a head start before hitting the rifling. This lowers pressure. Also, it's loaded hotter so even with the long leade it's higher pressure than 223.

If you put that 5.56 in a straight 223 chamber, where the bullet engages the rifling as soon as it moves, you get even higher than 5.56 pressure.

Many "223" chambered rifles, including the T3X, have a more gradual leade than the original "223 Remington" design, so they handle 5.56 fine.

 

[glock233]

In my Tikka

Negative on the BH

@fwafwow ive got some comparison. I’ve posted them previously but if you send me a message I’ll send it all to you.

Short version- The black hills is faster and the bone frog groups almost as good as black hills, maybe equivalent.

I think Bone Frog and BH are comparable. In my 20" Tikka 1:8 stainless:

-35 rounds of Bone frog 77tmk. 20” tikka stainless barrel. 2747fps average velocity. 44fps spread. STD dev. 13.6. Done at 82 degrees.
-59 rounds of BH 77tmk. 2728 average velocity.

This was 2025 production Black Hills, which some say has been reduced in power, but I've also seen that denied.

Having played around with 100 rounds of each, I would buy whichever is cheaper.

 

[Schmo]

If your standard is "it fits and I didn't die," then yes.

If you want to be operating within the designed pressure, then it depends on the leade.

A 5.56 chamber has a long leade so the bullet gets a head start before hitting the rifling. This lowers pressure. Also, it's loaded hotter so even with the long leade it's higher pressure than 223.

If you put that 5.56 in a straight 223 chamber, where the bullet engages the rifling as soon as it moves, you get even higher than 5.56 pressure.

Many "223" chambered rifles, including the T3X, have a more gradual leade than the original "223 Remington" design, so they handle 5.56 fine.

Yeah. I think any modern, quality 223 is going to be fine. In a Tikka for example, the same action can be used for 223 or 300WM. So how is 5.56 gonna be too much pressure?

 

[Steve300xcw]

For every 223?

I know it's fine in the Tikka T2X

My m77 doesnt like to extract 556's all the way unless you run the bolt real easy. Tis the only issue I have ran into running 556 though 223's.

 

[AZ_Hunter]

The Bone Frogs claim 2750 but don't specify a barrel length. I get about 2700 out of my 18" Tikka with the Black Hills. Hoping they are close.

I got 2650 out of a 16” Suppressed AR with the bone frogs 77TMK