Honestly...any broadhead will kill an elk. Everyone will continue to jump on the bandwagon for whatever the newest release is. Be confident in/with your shot and even the cheapest broadhead on the market will give the animal a dirt nap. I myself will probably stick with fixed blades because of personal experiences.
I use Magnus Stinger buzzcuts 100 grains. I think any broadhead will work as long as you make good shot placement. But some are tougher made than others!
Remember were way more advance than what native americans used back in the day and they had no problem putting game down on mother earth.