You want to start close for starters then gradually work your way back. Things can get dicey quick sometimes. I would have to be pretty confident about my set up to start at 20 right off that bat. Unless I had a large target and/or didn't care about wasting arrows.

And if you are going to try it beyond 30 yards remember that it will be normal for the bare arrow to hit a bit lower than the fletched arrow. At least this is what I have found anyway.

And don't expect them to fly perfect either, the fletching is there for a reason. Without it don't expect them to look right in the air or the target. The goal is that they impact with each other. It won't take much to get an unfletched arrow a bit crazy in the air, but no worries, that is what the fletching is there to correct.

I would also add that in order to bare shaft tune much beyond 20 yards you would have to be a pretty decent shot with very consistent form. Otherwise you will just drive yourself crazy.

Paul