A helical will definitely help. About the only way you will know would be to shoot the broadheads and practice with them at those longer ranges. If you notice a lot of changes from your broadheads to the field tips you may have a bow that is out of tune and need to do some adjusting. I would caution taking too long of a shot on game though as I am concerned that is where this post is headed. Every piece of equipment has limitations and draw weight, broadhead accuracy, field conditions, etc. limit everything. Just remember, archery is an up close sport and pushing the limits can increase the chances of lost game and wounded animals.