"It's funny how everyone complains about failsafes for deer. Well, duh, that's not what they were designed for!"
Absolutely correct BUT I've used them in Africa with my .338 Win. Mag. and they blew through EVERYTHING including an Eland (lung shot) which is a 2000 lb animal, lengthwise through a Wildebeest, through a Kudu (heart shot), lengthwise through a Zebra (heart shot) and a Sable (neck shot).
I was on a combo moose/woodland caribou hunt and could only take one rifle to the satelite camp. I shot a caribou five times through the chest (running after the first shot). They only slowed him down. I swear every rib was broken but only knick out the heart, lungs and liver each were evident. It finally took a sixth shot into the neck to put him down permanently. I really don't like to take neck shots especially at a running animal even though they are pretty effective.
In all the hunts mentioned above I recovered NONE of the bullets and, I and my guides could not decern ANY difference between the size of the entrance and exit wounds.