The biggest thing I don't like about those liteweight partitions, is they tend to shed the front, and while the metal cased base of the bullet surely does penetrate, it leaves the same size hole on exit as it does on entry, and when we're talking under 38 caliber holes, it doesn't take long for the thick underfur and long guard hairs on an elks hide to stop and external bleeding, and you're left to tracking and finding spots of blood.That in itself isn't bad in snow conditions, unless it's snowing heavy at the time, but can be a real gut wrencher in dry and dusty conditions.
I've also come to the firm belief, after killing somewhere near 50 head of elk and seeing many more than that get shot, that exits on elk aren't always the best thing, and usually when the bullet ends up as a lump under the hide on the far side, the elk will be recovered closer to the original point of impact.