I got word from the Bison hunter when he had his bull. He got penetration on both sides but the arrow did not completely pass through and exit the far side. He got both lungs and the heart and the beast broke his arrow in 3 pieces.
Live weight 2,4000 pounds, Hanging weight (without head, hide, hoofs or guts) 1,109 pounds. Total boneless meat is 717 pounds. It scored in the SCI top 20.
the guy's partner got his bull with a restored Sharps rifle and put 6 shots in the boiler room before his bison went down.
The hunter stopped by my house to drop off some pictures of his bison and to show me the arrow (all 3 pieces of it) The broadhead was as sharp and as good as new.
As stated, the entire head came thru the far side but the arrow did not completely pass through and out of the bison.
Someday I hope to go after such a great animal myself. I would love to try it with my longbow.