If ranger's bow IEMM is raised this wouldn't be a problem anymore, and wooden bow's damage raised.
As it stands if you put 100 points in Marksmanship you can take on every animal with a good sling with no problem, as opposed to Melee that takes a heftier investment to get anywhere. If I had to choose where to put 100 points I'd go with MM for hunting, if I had to choose 300 I'd go with Melee though.