Re: high shoulder shots on bears
Having only been black bear hunting once I'm sure there are guy's here who know much more than I, but judging from what I've seen I wouldn't advise it.
Bears carry a lot of fat and gristle high on their backs much like a hog so your bullet might pass thru on a high shoulder shot and not do enough damage to put it DRT.
The spine appears to be about a third of the way down from the back line, a rather difficult shot to make in low or very low light conditions. (Black bear, dark,my old eyes,etc.)
Gotta go with the double lung shot. Did see an old friend on his last hunt take a big blackie with a Texas heart shot. That got...exciting.