cool
I agree that magazines offering higher than factory capacity are fun. But elk, bear and near everything else, including big hairy and toothy things that can really hurt you (like lions, Cape buffalo) are routinely successfully hunted with 4-5 rd sporters. And as easbank noted, an extended mag tends to be an awkward thing.
You can never be kicked or gored by if you stay clear of a down animal that's still alive. Bear charges tend to close and sudden, and it's unlikely you will get through a conventional mag till it's over, for better or worse.
About the only rationalization for hi-cap mag in hunting that I can come up with are hog shooters and prairie dog shooters, both of who want to eliminate as many of the destructive critters as they can when encountered. Note, I did not say one shouldn't have hicaps, I own plenty, rather, the need for one in hunting is just not there.
A high mag capacity will seldom make up for poor shooting.