Another PB look alike: http://www.harvesterbullets.com/sabertooth.htm
They are stronger than PB, which you need to shoot at low velocity to keep them from fragmenting.
Frontier Gander did some experiments with PB atdifferent speeds and you can see where they pancake out and start fragmenting.

Hornady just came out with a sabotless PB look alike also, I have not tested or shot it, just recall seeing about it. Alot folks on here use Bull Stops for elk, I will let them respond since they have some excellent info about the Bull Stop, and it does Stop them big time, 460g.
Chap Gleason