Ok, normally I'm not overly concerned about over-penetration, but recently I've been riding a commuter train a fair amount and the people density is quite high. In this situation, it seems like it would be difficult to avoid having someone behind a BG.
I'm wondering if there is any ammunition out there that is effective, but unlikely to go all the way through a BG.
Specifics are 9mm in a 3 - 3.5" barrel, semi-auto.
I know about the Glasers, but doesn't seem like an overly effective round.
Your thoughts are appreciated.