The wolves I saw in West Yellowstone quite a few years back looked very much like a coyote except for their size. They were in a pen and I was close, so I could tell they were big!
But how do we tell their size when we're out hunting??

Truth be told, not enough of us have ever seen wolves in the wild to realistically be able to tell the difference in a hunting scenario.
A wolf in the snow at 200+yds could look just like a big coyote at 100 yds. Either way; most of us would judge the distance to be under 300 and within PBR and pull the trigger! Who would be worried about ranging them and sizing them in the reticle before the shot if we know their within "hold on hair and shoot!!"??
IMO, wolves outside their "protected area" should be considered non game animals just like coyotes are.
Glad to hear the guy wasn't charged with anything!!