Back in the spring I posted a thread looking for a place to hunt a Bison. I just got back from that hunt and my Godson and I both got a Bison with BPCRs, lead bullet, Black Powder and iron sights. Both rifles were 40-65 and neither animal went further than 25yds before piling up.
This was a canned hunt but we did have to stalk for awhile and then wait for a shot that wouldn't hit an unintended critter. Both shots were under 125yd which I had set for my max and both shots took out the heart.
My Godson was shooting a Shilo Sharps and I was shooting an 1874 Swedish Roller that was restocked and re-barreled to 40-65.
I tried to post a pic of my Buff but it wouldn't come through for some reason. The rifle picture and the freezer full of meat went through.