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Roughly the same as either a Federal 9mm 135 or a Remington 147 9mm, both of which probably have a little more penetration than the .40. The forty is fine if you like it; I prefer a 9.

In self defense stopping power is more important than penetration. That is why I shoot the .40 with the 135 GR COR-BON bullet. The one shot stopping power is 96% + and the bullet will stay in the perps chest. I don't want the bullet exiting the perp hitting an innocent bystander.

You didn't read my post. The stopping power is about the same. I also said the reason he shot 15 times wasn't because his load (likely a 9mm) was underpowered, but because he wasn't a very good shot. Shot placement is much more important than stopping power, since your 96 percent assumes direct placement. I can hit anyone with a .40 in the leg, and it won't stop him. Three shots with a 9 -- two to the chest, and one to the head, will stop just about anyone.

As far as exiting, the penatration figures don't mean exiting is automatic. I'm not saying the .40 is a bad load. Quite the contrary. But it isn't necessary as a well loaded nine will do the job just fine.