I know someone who shot a moose and the arrow went through it like butter. He said it sounded like he shot a big bag of jelly. But then I see pictures of other moose with a lot of back-end-arrow-shaft sticking out of them. Here in Alaska people get pretty angry, talking about moose and caribou they see running around with arrows sticking out of them.
I know that 50# is the minimum weight for them here. And I've got a couple bows in the 50s that I would be comfortable using. But I've never shot a moose yet, and it makes me cringe to think of watching a moose run away with most of the wrong end of my arrow sticking out of it. That's why I'm shooting my 67# bow every day before moose season...