Not sure why, but when I paper tuned my 04 Patriot I had it punching holes at 5 &15 yards with Beman 340's and Easton 400's. When I tried my tune nock equipped arrows the bullet holes went to ugly tears/rips in the paper.
I decided 2-4 fps wasn't worth trying to figure out what was going on and just took them off.
If they would have bullet holed also i would use them for the the string loop reason listed above.