This arrow gets crazy penetration on what I have shot so far. It definitely has a different cast than my normal hunting arrows in the 550 mark, but after some adjustment I was hitting pretty good. My first few were hitting way under that's for sure! Normally I wrap the nocks too, I just ran out of time(baby woke up from her nap lol) I will finish that detail soon. I didn't think about why the shafts are so strong Archeryrob, and it makes complete sense. I have been shooting Sitka spruce for the past six months. While they are good, certainly not as resistant to deflections and rocks. Also the glue bond is really surprising. I have had issues with heads coming off, even after wire brushing and acetone on the inside of the points. This one is stuck on there good! The feathers too! Might be a coincidence?