I got a deal on some 115 gr 9mm +P+ at the range the other day. I shot 30 or 40 rounds through my Glock 26. Quite a punch but not uncontrollable. Not sure if I'd try the same load in my PM9. Anyway, think I understand +P = more pressure, and understand that many guns are rated to handle +P, while others are not. However, I don't understand the +P+ designation. Can +P+ be shot through anything rated for +P??? What's the advantage of +P+ (aside from the extra cool, loud BANG)? By the way, the ammo I got is marked “for practice onlyâ€, and is Speer GoldDot in a bulk package of 250 rounds.