On Buff a broadside solid should penetrate the shoulder bone and get both lungs.

My main concern would be the shot impacting the bone and the angle of entry changing, getting only one lung and having a very pissed off Buff(albeit a three legged Buff !)to deal with.

I have had this occur with Barnes X solids on an elk shoulder but obviously the Barnes was not the quality or type solids you have used on Buff.