Well we must keep it in proportion - a .243 does more damage than a .222.
But I am sure it is just sheer velocity and a soft bullet. But I am not a .222 expert like others on this thread.
The smallest amount of damage I see is from my black powder .44-40 - it just punches a .44 calibre hole through everything - its only going 1200 fps at the muzzle and less than the speed of sound when it hits the animal. Actually a soft point .22LR will often do more internal damage to a rabbit for example, than that slow lead slug. The other side of the coin is that I doubt I will ever catch a .44 bullet from it, ten water jugs wouldn't catch one, and that's more than enough to hold a .270. It will always exit a deer, but you may have trouble finding the off side hole.
Theres no such considerations with the fast ones, the .222 and .223 and the .243's. So it's velocity. With the .222 the exit hole would sometimes be hard to find, you would skin it out and find it, but the entrance area and internals would be all bloodshot to hell.
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