Buckshot
I have shot many a deer with 00 and 000 buckshot out to 50 yards with a 12 gauge. Pattern ur gun with differant types of ammo, and use what shoots well in ur gun. Not all ammo will shoot well in one gun. Ive found super x seems to shoot well in all my 4 shotguns from sawed offs, short barrel pumps, to my longer barrel single shots.