Yeah, that was me on a different thread. It was actually just about TMKs in general.I tend to agree with Form (and the many others) who have posted in this thread in support of 223 as an option when the correct projectile is chosen. But I am trying to make sure I'm not in my own echo chamber, so I would love to see someone who has disagreed with him (or the views), or said something to the contrary, that was based on logic or anything other than historic custom. I personally believe that almost every topic is subject to nuance, so I welcome any exceptions or differing points of view - at least if based on data.
I don't recall any of your posts, so these are not directed at you, but "everyone knows you need X ft lbs of energy", "respect the animal", "margin of error" or similar bases for disagreement have not, IMHO, held up to the responses (and are usually just met with "I'm bowing out of this pi$$ing contest" or similar replies).
About the only cogent pushback (at least that I can remember at the moment) was the question posed (I believe by @Marbles ) about the effectiveness of a 223 77gr TMK on the skull of a brown bear.
If you, or anyone, can summarize a contrary point of view, I'm all ears - and expect I'm not alone.
I'll spell it out here though.
At close range and max velocity (muzzle to 20 yards) if I managed to put a TMK in a 1000+ pound bears face and it struck that thick angled section of skulls above the nose, could I reliable expect it to penetrate with enough remaining umph to go through the inch of sinus cavity and thin bones and still break into the cranial vault?
At further distances and lower velocity I think the odds would be better. I think an angled strike on thick flat bone will likely cause the bullet to fragment, I think the tissue coated bones of a sinus and then another layer of bone will be hard for the fragments to pass through. (Side not: the skull is heavier than most parts of a scapula and bullet would be striking a convex surface which is a stronger structure than a flat one, and probably less prone to shattering than a humerus as the bone is supported by more bone around it)
The next question, that I did not ask earlier, is if a TMK is not up to the task, is a larger bore with a bonded bullet (308) better than a bonded bullet from a smaller bore at general killing? I suspect it is, but don't know.
Now, I am not saying the TMK will not handle the job, but I do not see anything that clearly says it will and I don't think I want to bet my life (or the life of my daughter if she is hunting with me) on it. If someone would kindly make a frontal shot on a bull moose's head or a bull elk's at a range where the bullet is closs to 3000 fps I would appreciate it. For the record, I'm not inclined to throw a 168 gr TMK from my 308 either for the reasons stated above. I might convince myself to step down in caliber to a 6.5 using bonded bullet.
The other option, would be plan like I do when hunting small game, drop the rifle and draw the pistol.
Side note, my 308 Tikka is noticeably more enjoyable to shoot than my 30-06 Kimber Montana. Which is why I'm willing to consider turning in what is left of my man card and going even smaller than a 308 (so much for my "I want to hunt deer with a 375 H&H, because bears" idea).
If anyone has a pig to slaughter and is willing to try a 77 gr TMK through the thick portion of the skull at the upper base of the ear to kill it at 6 inches, I would be interested in the result. I will say, that section of skull can absorb three 230 gr Gold Dots and not even stun the pig (I felt pretty bad for the pig).



