I don't own a practice arrow I shoot all my arrows with 100gr.Muzzys and while practicing I will throw out any that don't perform well! Just because you spin test your broadheads don't mean they will fly good you may have one or two arrows that have a weaker spine or more or less foc so toss out any that don't perform then before hunting I pick out the best fleched arrows and replace the blades and re spin test and then use them for hunting