Dave makes good points about WC. I am about to switch over to Buffalo Bore's SWC .38 round, from the Winchester PDX1 HP round. The BB has a better velocity out of a short barrel, even the standard .38 load, and at the .38 velocities, I've decided I want penetration over expansion. The way I see it, HP bullets were developed in great part to stop over-penetration, exiting the bad guy and injuring someone else. At .38 snub velocities, I'm not worried about a round hitting someone after exiting a BG. In my very humble opinion, the risk of not stopping the threat because of a lack of penetration presents a greater danger than the bullet exiting.
My home has a brick exterior, and according to tests on The Box O' Truth, brick exterior stops medium handgun bullets. I won't be shooting outside, most likely, and if I am, I am not worried about exiting bullets (stopping current threat would take top priority, plus the other homes are brick too).
Pythagorean, that's a beauty.