For shreddable bison chuck best to use a braising method to finish. Smoke at low temps (no higher than 250) to an internal of 135/140. Foil with braising liquid(s) (beer--a fruit beer is nice, stock, wine, juice, coffee), including some unsalted butter and/or rendered beef or pork fat, and any aromatics (onions, garlic, chilies) and spices/herbs you'd like. Cook till very tender.