Jmortimer... that test of the Gold Dot .38+P from Brassfetcher was into 20% ordinance gel, not 10%. So 8.8 inches works out to be a very good penetration depth. See the comments under that video.
On another note, this thread is very interesting. Very curious to see how the Remington 125+P Golden Saber does in .38 in colder temps.