ORIGINAL: OHbowhntr
I'd always lean a touch toward overspine vs. underspine, esp. if you've considered upping poundage any at all. Theoretically, underspine equals more wobble which should result in poorer arrow flight, and more inconsistency. But the NUMBER 1 reason I won't shoot underspined is.....
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Scary? Yep but more than likely shooting under spine was not the cause. I have seen arrows that were over spined blow up as well. A damaged shaft will explode regardless of the spine.
I agree with most. You need to get as close to ideal as possible
Dan