You are never going to know if your arrows go into the taret straight because they will move when they hit it. It might work on a 3-d target, but not a bag target. If you have fletchings on the arrows they are straight by the time they hit the target. That is what they do.

I think you are going to over think this and be a mess before deer season starts.

Manboy does sort of have a point though. Just because your arrows broad heads are impacting with your field points does not mean you have the best possible tune. Although this is what most hunters strive for because it makes it easier to practice with field tips and then switch right to fixed blades and have it be on.

If you had the absolute best flight you could acheive that does not always mean your fixed blades would impact dead on with your field points at every distance. The determining factor would be how well they group at each distance.

However I don't feel they will be so out of whack you will lose a deer because of it. If that were the case they would not group for crap and you would see them fish tailing thru the air on the way to the target. Sometime things happen when your hunting, like making a bad hit or losing an animal. You can't always blame your tune or something like that, but ou are shooting at live game, things will not always go as planned. I have seen perfectly set up bows that lacked penitration at one point. It does happen. I have also seen badly tuned bows have no problem zipping right thru a deer year after year.

And the truth is your arrow does not fly striaght any way. It flexes most of the way to the traget, you just can't see it. And then when it hits the target it goes crazy as well. I have seen high speed footage of both and it's pretty wild. If you want less flex get really stiff arrows.

These are just my opinions as well. If it were me though I would worry more about how well you shoot, not how finely tuned your bow is. That is usually the determining factor. You can make a well tuned bow shoot like crap if you do something wrong before or during the shot.

Paul