I was hopping from site to site online - following my nose on American shooting blogs when I saw a reference to this 'Kiwi' experts site:
As I have only just learned of this NZ (Taranaki) based enterprise and their site - I'm unable to praise them due to my not being at all good with the technology and art of hunting.
However it does seem that they have some excellent information on the topic of effectiveness on target. ballisticstudies.com
If I were more of a rifle-man perhaps I'd have a better basis to work from eh.. but what I've read and seen so far looks great.
Take a look.. ballisticstudies.com