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.
I did about the same thing last year, except I almost got a pass-thru(only the half the fletching didn' t pass, but came out about 5 yards from the shot0.....only it was at 25 yards with a 100gr Thunderhead.....72 ft-lbs K.E. He went about 30 yards if that.....plowing with his front end on the ground the whole way. It was a less than perfect shot, and I was lucky....I know it was the exception rather than the rule.