I've had a bit of a different experience with .223 FMJ head shots on cattle. It was instant. Their legs folded under them and they were gone.

A bull in the stun box one day took 8 head shots from the captive bolt pistol and was still standing. A 223 FMJ eventually dispatched him. Cattle heads are very hard with thick bone, but there are so many variables in the equation. I don't think anything will work perfectly all of the time, but it is nice to know what happens to bullets and how they react.

Than you for your post Adoons. Please keep us updated as you go along.