I've seen this before with elk as well, also can happen with bears. Frangible bullets with no exit and animals can go a ways. Always need to take the time to look.
Thanks everyone who took the time to read and share your own stories! I don’t deserve any credit on this one; I was mostly along for the ride and by friends are far better trackers than I am.
Agree with many who said we owe a duty to the animals!