Probably low B. Caribou like to be moving along as they graze. Alone of in a group if they are moving and you want one you better shoot. Of course sometimes you get lucky and they are just milling around. Moose I've shot have been standing around.
NRA LIFE MEMBER GOD BLESS OUR TROOPS ESPECIALLY THE SNIPERS! "Suppose you were an idiot And suppose you were a member of Congress... But I repeat myself." -Mark Twain