I've read that.
It is a long and interesting read that boils down to one man's inexpert opinion. In other words, his opinion is no better than the opinion of anyone who has access to penetration information on ammunition in spite of the way he tries to build it up initially.
Here's the short summary of why his claims need to be taken with a grain of salt.
http://www.thehighroad.org/showpost....&postcount=102
If you want to spend some time reading, here's the whole thread which contains, in the first post, a link to the Smith & Wesson forum where deadmeat2 originally posted his ideas.
http://www.thehighroad.org/showthread.php?t=207527