Yep. Ive been going through whatever papers I can access this morning. Until I realised it was a sidetrack. Basically they said the projectile shape was biggest factor with frontal surface area creating both the biggest permanent and temporary cavities. What most did seem to spend time on was the imperfections of modelling in a homogenous compound.
Also the bigger the muscle, the more KE needed. For permanent cavities the best was a Brenneke slug.
And so it comes back too real world experience and we can probably all attest too less likelihood of an animal dropping and staying down long enough to expire with smaller projectiles.
Unless you hit the CNS.
It makes sense that an 80gr 223 is better than a 55gr 223 in that sense sure, and I dont doubt that enough is enough. But I have also seen when enough isn't quite enough. Doesn't mean the animal didnt die. But it did or might mean its harder to find/recover, and so having a projectile that performs with a little bit more leeway is never a bad thing.
An arrow actually creates quite a large permanent cavity. An inch and a half still spinning as it cuts through. Bullet or arrow, the cavity is about blood loss. But what it dosen't do, is create the extra temporary cavity or impart a heap of kinetic energy, or efficiently break bone. Yet due too its weight it has plenty of momentum. You can see what part of the equation is missing.
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