I've used them at both 100gr and 125gr. My bow/arrow setup does not like them at all.
I recently got new shafts and put higher lb limbs on so it's back to the tuning board. I'll give em another shot with the new setup and see what happens. I really like the head, just wished my bow did!
Total garbage from what I have seen. You may get a decent pack, but their consistency is awful. So many good heads on the market, no reason to roll the dice.