I think this is somewhat of a loaded question, in that it is realative to the set up you shoot.............if let's say you are a woman or young kid shooting a 35lbs. bow @190fps. any bone will present an obstacle,regardless of the head you are using, but especially so if your shooting a mechanical...........same would apply for someone shooting a 50lbs. bow with a 26" draw length at 210fps. and using a BIG mechanical, chances are it may get through the facing rib, but would stop dead in the opposing rib.

If you are limiting your question to bows shooting 250 ft.lbs. of KE or more,using modern broadheads,I would say no the rib bones of a whitetail deer would not pose a problem............but what exactly would anyone learn from this post? you simply cannot shoot between the ribs,because you normally cannot see them. So from 10 yards to 40 what is the difference? Or are you trying to make the statemant that some archers shooting lower KE should limit thier shots to a certain yardage or less, that would be something to learn from a discussion such as this............but other than that what value does this question have?

Not trying to be a smarta$$ just trying to understand the logic behind the question.