My Elk rifle is also my sheep, goat and deer rifle.
Bighorn sheep are always #1 on my list.
These days I carry a Browning BLR takedown, .270 win. It is great horseback and when I don't need it , it is put away easily in two or three pieces.( quick detach scout scope) .
Heck, I can even bore sight the thing. I don't hunt the longer ranges, Bull elk must be 6 point, rams full curl.
It sometimes takes great scrutiny up close to evaluate. 400 yards is a long ,long shot.