At 620 rpm, we were at 7 feet with 75% accuracy. However, that was just our latest prototype. The real thing will be ~4200rpm max with guided rails for more accuracy... so we'll see
Of course we're scaling it back down to 10-12 feet for accurate shots, and 3-4 feet for maximum throughput. I do like the idea of a miraculous cross-field shot though...or a 'rain' of orbit balls from 20 feet in the air

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