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How accurately? Also, accurately as in you're lobbing it, or accurately as in you're shooting a target? If you're shooting a target, compressed air is definitely where it's at.
What's your budget? For probably $20 I can help you build what amounts to a mini potato gun that will put a marble through a piece of plywood at 3m.
If you have to lob it, I'd say make a trebuchet. It's easier to calibrate and more consistent than springs.
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twisted no more
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