SHOT No2:
Hit the middle of the bone.
Arrow penetrated well. It broke the bone in two and penetrated the target 7 inches. However the tip of the blade is bent.
*Note that I shot this bone at the bottom with the Viper-tricks before (see the hole below on the bone). It might have fractured the bone already.
Helix did much better than in the first test. I was expecting the helix to be tougher (test 1 blade broke and test 2 tip was bent).