I emailed swhacker and this was their reply:
Tom,
Thanks for writing. Yes, you can use all of our heads in crossbows.
Best,
Daniel
Daniel Dye, Director of Sponsorship Activation
The Powell Group, Inc.
4162-B Carmichael Court
Montgomery, AL 36106
However, I went on their Website and found these: http://www.swhacker.com/product/swha...grain-175-inch
So if I can use any of their products, why would they make a crossbow specific head?