All due respect to those who have added to this topic. I am not trying to argu, just giving my opinion based on substantial experience. If you do not have a save place to bareshaft tune, do not do it, it can be dangerous, especially if your shaft if not correct spine. If you get it right, you can shoot broadkheads on bare shafts from 20 yards. We have done it repeatedly.I for one have bare shafted broadheads many times. I will say that if you have not tried it you might be surprised to find out how bad your shaft is out of spine with the broadhead. Generally, I have found that a shaft spined perfect for a field point will fly weak when using a broadhead of the same weight. With the broadhead, the weight is farther from the nock making the shaft spine weaker (similar to shooting a longer shaft). Most people have to shoot a shaft with a broadhead of about 1/2 -1" shorter than if shooting the same weight field point. I have seen broadheads miss targets by 15 yards when shooting from 15 yards with shafts of improper spine, that is why most people do not do it. It is very dangerous when shafts are too stiff or too weak. When we are tuning for broadheads, we first shoot from only about 10 feet, make shaft spine/length corrections and do it again. We back up a few feet at a time until we have it dead on.
It takes time and patience and a safe place. We have plenty of space so no worry about killing someone. But, the bottom line is if you want a perfect flying shaft, bare shaft tuning is the way to get it right. All of the above response are correct in saying there is danger involved. But just shooting a broadhead can be dangerous if not done correctly. I guess I belive that if we are going to shoot at an animal, we owe it to the animal to do everything possible to get the perfect shot placement. Poorly spined broadhead shafts will "sail" left or right and can cause poor shot placement and wounded animals. We just try our best to get it as right as possible.