They should fly the same. I also use an old bag target for broadheads, and the Muzzy practice blades work very well. A few nights ago, I misplaced my Muzzys, and had to quick grab some other broadheads with conventional blades (I was in a hurry!). Digging those heads out of the bag target was a pain, where the Muzzys pull right out.

Nice Avatar, BTW.