I'll go out on the limb and disagree with you. I think the bullet exploded shortly after impact and didn't penetrate deep enough to end the hunt. At the impact range you stated, the bullet hadn't lost much velocity.
Game usage description for this load at midwayusa claims it can be used for black bear. Funny how that same bullet listed as a reloading component does not mention black bear usage as a recommendation.
I think a different bullet would have served you better.