I've wondered the same thing Coug, there aren't many people that are going to test their bow out at IBO because there aren't many 30 inchers out there. It would be pretty to falsify info.

I have a question, if you were to measure the dia. of a 3 blade head, wouldn't you take the distance from the tip out to the furthest edge of the blade and multiply by 2? Obviously it's easy with a 4-blade.

I think they should add the word "approximate" before each spec...or at least advertised a range of acceptable tolerances.

Now I can blame my equiptment for my poor shooting!Thanks Guys!

I'm not sure how the industry measures "cutting diameter" but sayif on a 3 blade head you just measure from the outermost point on one blade to the outermost point on another blade thatwouldn't be right. I think you have to take all three outermost points then draw an imaginary circle encompassing them. The diameter of that circle is the advertised cutting diameter.

edit: the diameter of that circle will always be bigger than your measurement from blade to blade because of the arch in the circle. Does this have something to do with your measurements coming short?

Yes, I just took the widest point from blade to blade. Perhaps thats not right because it does leave out the third blade. Don't really matter to me on this particular broadhead though(Rky Mtn. Turbos).....I just bought 11 of these heads with an additional 15 extra brand new blades from a guy who likes to try new heads each year, at a rock bottom price.