I don't think I've ever seen a bullet fail to put down an animal. What I have seen is poor shots fail to put down an animal. Either poorly placed for the bullet used or simply poorly placed regardless of the bullet. Something you can't escape is a bullet, any bullet that destroys something critical, kills the animal! Quite simple really. The old story , I made a really good shot but the animal ran off just don't hold water for me.
2 different friends, 2 different deer, both 150gr Rem Corelokts.
The one friend, I watched put 5 shots into a does chest from 30 feet at the furthest distance. Kept getting up. Savage 99 in 300 Savage.
And this is after we had found her already gut shot.
My 280 Rem to the head finally put her down.
Neighbor.
30-06 with 150gr Corelokts.
Shot buck (about 50 yards according to him). Buck went down & got back up.
when he showed me the buck, there were 5 bullet holes in each side, going through the ribs.
Friend with 30-06 using Barnes. (I don't know which, or what grain.)
I watched the doe coming in. They were passing him, coming towards me.
I saw the shot hit behind the shoulder.
Her butt touched her nose, and she took off.
Not recovered. Tracked for over 500 yards.
Same friend.
Another doe. I watched a good hit behind the shoulder. Again, took off.
Luckily the snow let us track her.
she made it about 1,500 yards.
Uncle I set up to shoot his first deer of the year. Doe came in. (about 30 yards)
He was using 30-06 with Barnes.
I watched the hit again.
Again, another doe running off.
No recovery.