I killed my first elk with 100 grain two blade vortex . Made a bad shot , angling towards me at 21 yards , but the tracking was tough , she went nearly 1/2 a mile , bedding every while . I know the broadhead would have performed better had I done my part on making a better shot . I also watched my partner slamm his bull at 30 yards , the bull whirled to run , cow called and he hung up again in view . Bubbles were sliding along the arrow shaft with every breath , never went more than 40 or so yards , worked just right . I know they've made em better since then , but I don't shoot them anymore , too many other broadheads that fly just as good and are fixed blades , I now shoot rocket ultimate steel 100s' , they are awesome and fly great . Complete pass through on my elk in 03 , never knew what hit him , just zipped right through him , less than 20 seconds and he was down.....I agree with above post too , find one you like , research it and fit it properly with arrow weight and your bow , make text book shots and you'll do fine ...