I recently joined a French hunting forum called Grand-gibier.net, on which a free software package designed to build a database of statistics on everything to do with hunting is available. You can download it and participate in the exercise if you like, but it's been going since 2008, so there really is a wealth of statistics here on all the topics that we love to argue about. Here's a direct link to a summary of the figures for the 2012-2013 season:
I realise that the text is in French, but mostly, it's all in numbers which are universal. Topics covered are:
1. Popularity of different types of large game hunted.
2. Ranking of popular calibres.
3. Average shot distance and average running distance, broken down by calibre and bullet (that's going to cause some debate).
4. All of the above broken down by different forms of hunting, i.e. stalking, high-seat, driven, etc.
And lots, lots more. This should keep you arguing all the way through Christmas. I plan to install the software and join in, although I just won't have very much to contribute, given the low frequency of my outings.
I think that the chart on where animals have been hit is an eye-opener. The thorax is the main one, but the second is the abdomen, which is probably because of the proportion of driven hunting, but still, the odd visit to a moving target range seems in order. Of course, there aren't many about, so that's not easy.