If they aren't steamed they drop the same as anything else. It's only when their blood is boiling that they get dodgy. .308 into the brain box doesn't help them much, they keep going if they have momentum but the control and central processing unit stops working and they tend to go in the straight line through everything until they either run out of go forward or something trips them up and they go down in a thrashing heap. I used to have a semi auto for those things, now not an option.
The military 147gr FMJ is designed for a totally different purpose than hunting rounds - they aren't intended for humane kills they are intended for Geneva Convention compliance.
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