RE: Who said that physics wasn't fun?
I didn't mean to imply one arrow was better than another. Actually, when I started this thread I had just been in a debate where KE was continually referenced doing momentum's job. Being a physics kind of guy, I felt compelled to defend momentum (in my experience with archery folks I have NEVER heard the term momentum used without bringing it up myself).
A story. I was with a friend of mine deer hunting in Utah. He shot a small buck poorly. The arrow entered the deer around mid rib cage and traveled back through everything until it hit the femur, which it broke slap in half! The shot was at 40 yards. The arrow was a big ol' lunker 2315 tipped with a 125 grain Bear Razor.A very impressive display of penetration!!