I'm curious too. Back when I used the .338 a LOT put quite a few 250 Partitions into various big game animals. They ranged in size from mule deer bucks to an eland pushing 1500 pounds, and the only 250 that didn't exit was the first shot on the eland. It hit a tiny thorn-branch just in front of the eland. The bullet still landed where I'd aimed, just behind the shoulder, but the twig did turn the bullet sideways, so it punched a perfect Partition silhouette through the hide. The eland took off behind brush, where we found it in a clearing a couple minutes later, standing with its head lowered. A second 250 through the chest, from the other side (which landed point-on), dropped the bull--and exited. Also shot 250s endwise through a mule deer buck and a blue wildebeest bull, about the size of a mature bull elk, both exiting.
In fact the only .338 Partition of any weight I recovered while using that rifle was a 225 from a huge musk ox bull, the size of an average cow bison, which I shot twice. The first shot broke the near shoulder as the bull quartered toward me at around 175 yards, and exited the ribs on the other side. The bull spun around a couple of times, ending up broadside, whereupon I put another one behind the shoulder--which tipped the bull over. It ended up under the hide on the far side, retaining 85% of its weight.
Didn't use the 210 much, especially after finding out how wellthe 200 Ballistic Tip worked, but they all exited too. Though a friend had one stopped by a rear-angling shot on a mature whitetail buck.
I've shot a few moose back in the 80's in Alaska and never saw a 338 250 partition exit a moose Killed them well but none exited
This has been my experience as well, not just with the NP, but even monolithic bullets. Had a hunter two years ago shoot a big bull moose with a 338 at less than 10 yards and the bullet didnt exit. That one was a Barnes X. Had a guy shoot one at about 60-yards this fall with a 300 winchester and again the bullet didnt exit. He was shooting 200 grain NP. Moose are big animals and it takes a lot to get an exit wound. The most reliable way to do it that Ive seen is with a 444/45/70 with hard cast bullets. They will almost always exit.
