Can anyone provide a diagram or picture showing where to aim on a bison? Preferably one that shows the vital organs. Boddington's book has a nice picture, but I'd rather not spend the money if I can find something similar online for free. Thanks!
Well for non-dangerous game I shoot too take out both lungs. On dangerous game you need to take them in the CNS or take out the shoulders to stop any forward progress.
A vitals shot shouldn't be any different than any other game, but one could be fooled by the large humped front shoulder. The spine drops down into that hump quite a ways. Keep the shot low behind the front shoulder and you should be in the kill zone. Worked well for my wife some years ago. Sorry no picture to offer you.
Every animal is different, but my bison wasn't too hard to drop. I shot a really large bull out of the Farewell herd 4 years ago and dropped him with two shots to the lungs - didn't take more than 5 steps. I'd rather put a hole in his lungs and let him run a ways than blast his shoulder and lose even a pound of that precious bison meat.