I have seen two "bullet failures", if you can call them that

One was a Winchester Super X factory load in 6.5 x 55. loaded with their Soft Point bullet, not Power Point. I se today they are loading Power Points in that load. Shot a small mule deer buck at about 70 yards, buck ran baout 50 yards and dropped. It was a chest shot and the entire side was a bloodshot mess. Maybe hit a piece of buck brush before the deer?

2nd was a puzzler. Not so much a bullet failure as a load failure. Shot an average sized Saskachewan whitetail buck at maybe 80 yards with a 30.30 Rem CL factory load.. It exited the bluff and I hollered at my Dad who was on point he nailed it on the way out. I couldn't figure out how I missed , and was disappointed in my shooting Upon skinning, the CL bullet was found just under the hide on the onside shoulder meat, fully intact.Non expanded.

I am guessing it was a low powder charge