I have heard of 5 and 6 GP lb, but never 10. My friend got an easy pass thru, going through 1 rib on each side. He shoots 65lb BUCK, 25inch arrows that weigh 10GPI with 100gr Rocket Ultimate Steel.
His set up paper tuned excellent as well at 6 and 12 feet, deer ran in a circle about a total of 100 yds, crashing into everything in its path. It probably would not have gone that far but he hit it high on the double lungs.
I forgot which book I saw it in but there was a picture of a 500gr arrow and something like a 300gr arrow shot into different targets. the 300gr one was obviously chronographed much faster and only penetrated an inch or so LESS than the really heavy set up. I will try to find a picture of this.

****UPDATE**** Do not do a google search for arrow penetration images!!!