It all comes down to shot placement, pass through and then cutting diameter.

I have a friend dead set in love with the rocket sidewinders. He has shot and recovered 8 animals since he switced to them (I witnessed 3). He' s a believer in them.
Pass through with a 1.5" cut is the key to his success.

I have killed 2 does with them and am also impressed, but that hasn' t stopped me from buying other heads since then.