When they don't it's a tuning issue OR...... it can also be a spine issue. If they group but not in the same place, it's tune. If they're high, low, left right and all over... you got the wrong arrow broadhead combo for your bow and style of shooting(fingers or release) Shoot your broadheads and then see what you have. If you're around archery long enoug(not too long) you'll learn that what THEY say is not always so. If a guy has a poorly tuned setup he'll give you all the horribles. If he has a well tuned bow and is set up right he'll say, Nothing to it.

P.S. Psycho... nice 10 yard group. LOL[8D]