So you've called in a bull moose and he comes out of the trees and stands at the edge of the cut facing you at 200 yards.
He's huge with a massive spread of antlers.
You have a 30-06/308/270/280/300 mag/7mm Rem mag class rifle. Can you kill him with a frontal shot right in the middle of the breast or do you hope to wait for a better side-on presentation?
You know from experience that if he is turning to show you his side, the next next thing you will see (and in a big hurry) is his back end.