I would agree 110% with 5 shot about mechanicals and elk. I learned the hard way. This season I was able to get a shot at one of the biggest elk I have ever seen, much less shot at. I was using shockwaves and hit a little far back but within the kill zone. Well the arrow didn't get much penetration and very little blood after 50 yards and then none. The arrow just cloged the wound and didn't allow it to bleed. I searched for two days and didn't find the elk. I immediatly bought some innerlock heads and tuned the bow to them. I was disgusted with myself for weeks and almost didn't hunt the rest of the season. Do yourself and the elk a favor and use a good fixed blade head. Don't make the same awful mistake that I did.