RR I agree 100% with you. Black bear simply ain't that hard to kill. I haven't taken as many as you, only 5.I had a 6th one get away on me. I shot them with 300WM, 30-06 and .45-70 and 308. But unlike you all but one of mine were moving but I wasn't participating in a drive but they were likely pushed by someone. The ones I recovered either dropped immediately when hit or only traveled a short distance. The one that got away was hit 4 times with the 308 and Rem Core lokts 4 times. First in the gut, the next 2 in the center chest as it was running straight toward me and the 4th behind the left shoulder as he went into the thick laurel. (I could see all the shots as it rained the night before and his coat was soaked. It splashed where he was hit). That bear was killed by another hunter about 200 yards away), BTW that is the reason til this day that I have a bad taste the 308.
But back to the main point - you hit a bear solid in his boiler room he will die pretty quickly.