Interesting, they recommend a double lunger. Something about questioning the ability of typical small caliber high velocity bullets to be relied upon to overcome bone impact.
Its called "aim for the big spot"...
I used to do a lot of neck shots on deer than one day on the biggest bodied mule deer buck I have ever seen I missed don't know how I did but I did.
The way it was standing is if I shot it in the lungs it would have taken out the off side shoulder I didn't want to ruin the meat so I aimed for the neck and promptly missed.
I now unless I have no other option aim for the "big spot" = most bears and deer I shoot now are double lung shots.
My last grizzly skull measured 24 3/16" was both lungs and out the off leg/shoulder with a 300gr Partition @ 2800fps out of a 375RUM and that bear still made it over 80 yards into the thickest bush I have ever tracked anything in.