I have been think about that all day the box says 2550 with. 16" barrel. I was way surprised that the bullet did not pass through. That big buck dropped like a rock only moved once front leg went up. My thoughts are that the 110 Hornady BTHP match factory load must have hit his ribs and blew up. I took it to a processor so I could not tell in the beginning where I shot him he was not bleeding until he took his ride. It was a big rush. Hunting suppressed is way cool adding the SBR and it gets way fun. I am sure all the gun powder did not burn. I thought I would have to shot again. It is all about shot placement and the bullet.