We all make bad shots.
My 2017 cow was shot at 225 yards with a 300 WSM, 165 Gr Barnes. More than enough medicine right? I spotted her in the open after hiking 2 miles over a 2500 foot rise. Breathing hard, no rest, no where to go, no shot from prone because of the roll of the hill, took a kneeling position and first shot grazed her front leg. She took two steps and stopped, second shot missed under. Third shot broke her back above the shoulder and she went down, sliding down the hill on the snow about 300 yards (This would work in my favor on recovery), but she was still very much alive and calling the rest of the herd in a panic. Finished her with a head shot from 50 yards.
I felt terrible. The spine shot I found the bullet under the hide on the far side. Looked like a text book Barnes expansion... but elk are tough critters.
Giving the benefit of the doubt maybe this was just a bad day...