If you aren't shooting a bow with 60+ ft/#'s of KE, you shouldn't be shooting a LARGE CUTTING DIAMETER MECHANICAL ANYHOW!!!! If you are shooting a 50# bow, you should be sticking with a Cut-on-contact like a Magnus or Silverflame or maybe even a Sonic. MANY of the Mechanical BH haters are guys who never had any business shooting them anyhow. Not trying to be mean, just HONEST!!!