Just go buy a pack, try 'em, you'll like them, it's pretty much GUARANTEED!!! I punched the same BH through 3 deer, 2 coyotes and a blue grouse (lost it on that grouse as well), and if I hadn't lost it, I'd still have been shooting it this past season. I have one on an arrow right now that has been through 2 deer and a coyote, and will likely go through a few more animal this season. And all that was without any blade changes. The blades are SHARP, and they re-sharpen pretty easily with a small sharpener, like this ( http://www.amazon.com/Lansky%C2%AE-M.../dp/B0001WP336 )
or this ( http://www.rei.com/product/780741?cm...5-001b2166bec9 ).

That second little sharpener is the one I use and it's a GREAT little sharpener for BH's!!!!