My first bear was taken with 2 blade magnus at 125 grains.that bear went 30yrds and he lasted 10 seconds,that bear was hit perfect.The second bear was a double lung and he went 75 yrds!Although the blood trail can be tough with a bear there is no doubt in my mind that a SHARP 2blade will kill quickly.I shot a spike white tail acouple years back from a tree stand and put the arrow through him from directly above.I hit the lungs as it went through 6 inches to the side of the spine.He ran a hard half circle and was dead on the trail 45 yrds from my tree!I am confident that when i hit the vitals the 2 bladed broadheads work.