http://www.highbeam.com/doc/1G1-140288022.html
http://www.accessmylibrary.com/coms2/summary_0286-15132928_ITM

Even an air rifle can be fatal...but the idea that buck is a good hunting load strikes me as wrong. Even police (in the US) are moving away from shotguns to 5.56mm rifles (AR's mostly) and most people here wouldn't use 5.56 for hunting anything bigger than bobcats. Slugs don't cost much more than buck, and I've never heard of anywhere in the US where slugs are banned but buck is OK. Comparing a 00 buck pellet to a .338 WM is just silly, and the fact that I'd rather not get hit by one isn't testimony to it's effectiveness - I'd rather not get shot with a air rifle either. 00 buck is more like .32 NAA or .30 Luger - not exactly big game loads.