Perfect Elk Pelt

How to get the Perfect Elk Pelt for the Legend of the East Satchel in Arthur's story in Red Dead Redemption 2.

You will need the 

Time of Day: I think I mostly see these in the early morning.

Location: The best place I know of to find elk is up at the hotsprings

Longscope Rifle (I think?)

I will update this when I am certain, writing from memory, but I think the longscope rifle like the Carnaco is the best for elk. I also think you can rope them, but will double check on that and update this soon.