How much kinetic energy are you shooting to blow thru two shoulder bones (not blades)?
The reason I ask is , last year I was shooting 70ftlbs of kinetic energy and I blew thru one shoulder bade and the arrow came to a dead stop when it hit the opposite shoulder bone. The shot was 15yds with a NAP spitfire.
Operating under the assumption that most of the typical expandable heads lose some KE to open the blades then, theoretically, you might have had enough to push through both shoulder blades if you used a cut on impact or trocar tip style broadhead. I am not making any judgements but rather an observation.
In response to the original question, I have never had shoulder blade shot...intentionally or unintentionally....so I honestly would not know.