Guide I konw in NY likes to shoot them in the shoulder so they go down fast and can't run away , i think its because he has seen people lose them because the blood trail peters out pretty fast from the fat clogging the wound.
That said i shot 1 with a 30-06 ,220 grain bullet just behind the front shoulder , hewent nowwhere, i would probably not take a shot dead on at the sternum , but .... might get too excited to not shoot too. ..
Hel likes 12 guage slugs for bear also , but myself i liked the 30-06