We do a simple alternate elk encounters, it's usually clear if it counts as an encounter or not.  That way if one day the action is hot with multiple call-ins the guy that hunts the next day and doesn't hear a bugle doesn't get screwed.  It works well for us, split the meat regardless and if one tags out the other is obviously calling. 
In our case we usually have one guy pack out the elk and the other gets to keep hunting.  It's a bit of a trade-off with more work but that's the reward for killing one.  Idaho a couple years ago after tagging out my hunting partner sent me an inreach he had one down after I was back to the truck with the 1st load.  That doesn't happen if we don't split up after I kill mine and pack it out solo.  It was a rough day and a half of packing elk meat but it's that type 2 fun we all crave.