Shaw, as far as BHs elk hunting, fixed are proven over time. A lot of States have just recently made themlegal. Reviews are mixed. Quick bow any fixed head will do as long as you’re tuned. Slow bows and low poundage bows can use them but COC is most hunters preference.
Bad shots happen on all species. An elk survives almost all bad hits if its not to the guts.Deer sometimes die anyway. We have found multiple bullets/broadheads cleaning elk and elk often leave poor blood trails due to the wounds quickly clogging something. Biggest failure shots are the new guys thinking how cool frontal shots are but, they aren’t proficient enough to pull it off