I know this is an open ended question and there are a million different reasons. I overthink everything lol! Thanks for your responses. I shot 3 animals this year with the factory loaded 212Eldx and I'm not impressed. All out of a CA 300PRC. 2 died, 1 got away. 2 harvests were a blacktail buck and buck antelope. Both at 400 yards and the entrance hole was huge with no exit. The one that got away was a nice boar black bear at 200 yards. Hit him right behind the shoulder...No blood and no bear.
This is why I do not hunt with ANY Hornady bullets!
I tried the 208g A-Max out of a 30" barreled 300WM on our Sambar deer….worst decision I ever made. Shot was a tad over 600. First shot was behind the shoulder quartering away, deer dropped and I racked another round. Deer got up and started hobbling downhill, hit him again but from the other side to the first hit, no reaction so I hit him a third time in the spine. Stag was still breathing when I got to him but passed soon after.
The entrance holes on all three shots could have fit large Grapefruits in them, no pass through and the meat was peppered with shrapnel.
This was the day I no longer used CHEAP Hornady bullets.
As to choosing a bullet.
I look for accuracy as NUMBER ONE, then performance on game, this manifests itself in many different ways, but personally, I use bonded bullets, except Partitions, almost exclusively.
Of the bonded variety, I use Swift, Nosler, Speer and Woodleigh.
I'm using a lot of ABLR bullets lately. Their accuracy is very good for me so far and the performance at range is second to none. Have used them below the 1300fps lower limit and they expanded….barely.
Was testing more this weekend just gone and had groups go from triangular to vertical to horizontal, the only other bullet I ever saw that was with Berger OTM's.
There wasn't even a breath of wind, so know it was the tune coming in and out.
Cheers.