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Using the fact that the bullet fell approximately 1 inch as it travelled 100 feet, I predicted it should travel 600 feet down the firing range before hitting the ground from a height of 36 inches. Instead, it actually travelled about 360 feet.

Am I right in assuming that this discrepancy is due to air resistance, and that the simplifying assumption of neglecting it is just way off in this case? I'm trusting their rough numbers here, but even if I double the height through which the bullet fell in the 1st 100 feet I still predict it should travel 450 ft before hitting the ground.

Thanks in advance.