I know 4/10s of an inch is small, but with handgun ammo every inch or fraction thereof is vastly important. Gel tests represent the best penetration possible, not what you are actually going to have once bones and ligaments get in the way. I'd be much happier with 15" of penetration, so 11.6" does look bad to me. The 9mm went to 13.9" which would make me feel alot better about using it if I had too.
Now for the antidotal:
If you've ever shot a skunk with a .22LR, just to have it retaliate with spray, you will go to a bigger gun quick. I've shot two skunks and two opossums this week. One of the skunks took a .40S&W HP (I'll have to double check on what ammo I was using later) in the shoulder, but I could not find an exit wound or the bullet, despite being in an enclosed wooden feeder where it had no place to go. A vulture ate it before I had time to get back. It appears it expanded and never exited. I used a Glock 22 because it was after dark when the nightsights were helpful. [edited to add: I found the pelt and there is an exit hole. What happened to the bullet in an enclosed space is a mystery. Maybe it ricocheted back toward me]
Later I shot another smaller skunk with a .380 using Remington HPs (I think they are called Golden Sabers). It tore a massive wound through both shoulders, hit a 2x4, and bounced back into the shoulder. I was impressed. Then this morning I shot a big male opossum with the same .380. There was no visible wound, but he did have some blood appear on his feet. So I shot him again. This time he dropped and started bleeding from the shoulder, but I could not find an exit wound. I kind of lost faith in the .380 for the tougher of the smaller critters after this morning. [edited to add: On close inspection there is a exit wound on it too. The backround was dirt, so there is little hope of ever recovering the bullet]
[edited out]
(If anyone wants to jump on me about shooting skunks or opossums I'll relate the incidents where I found headless chicks, ducklings, and the gold kitten missing most of its body
).