Thanks, guys. Those links were very helpful, although they immediately passed forward to the generic Google homepage immediately when I was using Chrome. Weird. It didn't do that in Internet Explorer.

It looks like I should definitely only take broadside or quartering away shots.

Follow up question: The "boiler room" on a whitetail is typically about an 8 inch pie plate, right? So what is the boiler room on a black bear equal to? The same? A little bigger or smaller? I know it must depend on the bear's size, but what is typical, for, say a 250 lb black bear?