I had a similar problem once.
It was the weirdest thing.

Turned out to be a bad combination of poor clearance off the rest, and broadheads that didn't spin true.
So the thing started out minnowing from hitting the rest funny, and then the crooked BH played off of the original interference and kept it from ever stabilizing.

The result was the coolest looking corkscrew flight I've ever seen.


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