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The throwing dart guys have put a lot of thought into this. That is why they use a heavy metal in the front, and aluminum back by the fins. Now, our fins/flights (cones) aren't nearly as effective as those on a throwing dart since cones dont provide a great deal of directional stability. So, front mass can be even more important. Again, this is all IMO.
 

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So we figured out the wobble, but why the veering off of course after about 10m? It is very strange, they get to about 10m and then they take a 90 degree turn left or right
The aerodynamics may be such that, after it slows down to a certain speed, the mass of the dart may not be enough to keep it on track. The weight issue is also involved here as well.
 
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