All my shotguns shoot buckshot best with 2-3/4" shotshells and a full choke. Other people's guns shoot best with 3" shells and a modified choke. Some people like 3" with a full choke or 2-3/4" with a modified. You just have to find which brand, length, and choke your gun shoots best.

My Mossberg 500 12 gauge shoots best withFederal 2-3/4"00 Buckshot and afull choke, but it patterns slightly to the right. Not much, but enough to notice. That's why patterning on the range is so important if you want the most out of your gun.