C903,
This is the statement you seem to be so hung up on. Why, I have no idea. Would it suit you better if I had said an underspined arrow can SEEMINGLY tune perfectly with FP' s, but will impact differently with BH' s???

The reason I said it can tune perfectly is because the underspined shafts I had trouble with DID tune perfectly. They even shot a perfect bullet hole with a bare shaft. That same bare shaft also flew perfectly to the target out to thirty yards and impacted just below the fletched arrows, just like they are supposed to. There was no problem with them at all except with broadheads. The main reason I mentioned this is so that others will know that getting an arrow to shoot bullet holes is not necessarily the end of it. It CAN be underspined and shoot bullet holes. This means that one should always shoot broadheads (preferably fixed blade) to ensure that the arrow will fly correctly with them. If it is flying well with broadheads and impacting the same as the FP' s then the spine is most likely OK. If, however they impact differently than the FP' s after the bow has been tuned, then the spine is the first thing I would investigate. If the broadheads act finicky and are very sensitive to form, the shafts may be on the borderline. Turning the poundage down or going to a slightly stiffer shaft should correct the problem.

Now, if you would like to continue to discuss this and actually add something useful to the discussion, I' m game. If however, you continue to just play with words and not add anything useful, I will do as Fletchhead did and take my perfectly tuned and great shooting bow and walk away.

Your last couple of posts remind me of Clinton on the witness stand. You know your busted, so you try to change the focus of the thread. It didn' t work for Clinton and it ain' t working very well for you either.

Edit: What kind of bow did Albert Einstein shoot??