This is how it must be for top gun 30-06.
1=animal must be stopped and broad side and not past 200 yards.
2=ears must not move ,,no blinking eyes ,,tail cannot wag.
2=no wind ,,perfect light ,, not to cold or hot ,,no overcast sky ,,and no rain.
3=NO ASS SHOTS,,NO HEAD SHOTS ,BY THIS I MEAN A SHOT JUST BEHIND THE EAR WHERE THE NECK ATTACHES TO THE HEAD.
4=bottom line...you can kill a elk with a 243 but I prefer any of my 300,or 338 cal.
You can kill it with a head,,or ass, or ,gut ,shot and I have used all...For a gie that has waited,, stacked up points in a state and drew that tag and a monster bull comes into view,,the thought process is to put that animal on the ground now and the humane lines goes out the door...Same goes for your winter meat,,kill it and put it in the freezer..Every situation is different and with elk hunting or any other animal for that matter things change fast and you must take the shot that fills the freezer.. I only needed to use the ass shot one time ,but I did and with a 338/378 weatherby mag the elk went down on the spot.