I used they this year for elk
I started out using golodtip XT5575
had it sited in for 30/45/& 60yards. then I ordered a doz. of the speed pro's
I used the 100g shockwaves. they shot the same as the goldtips upto 45yards
then at 60yard they were 12.5" higher then the goldtips & with the sames groups throughout all yardages. I seen the advantages of this in guessing yardages. I have shot some deer with them no problem with the arrow breaking
all were passthurs the $ is up but I feel it is a small price to pay for misguessing the yardage & having a bad hit.
Greg