handirifle.
You can kill Black Bear with just about any rifle and bullet as long as the bullet stays together.
My old long gone friend used to shoot them with his .22 Ruger target pistol. Or any other gun that was handy. 32 Special, 30-30, 44-40, 303, 22Highpower he even killed one with an old 57 Snyder. His brother figured the 22Hornet was the best bear medicine. You figure that one.
He had a farm in the woods polluted with Black Bears could not keep them out of the vegie garden.
You are loaded for bear with a 243 partition.