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I'll try to do the math, but give me a while, because like I said, I dont remember shit from high school. To be useful, I still think you'd need a velocity exceeding 1000fps. And to retain most of this velocity, you'd need a fairly heavy pellet. Heavy pellet + high velocity = very painful. A .177 pellet gun pellet weighs 0.51 grams. A 6mm airsoft bb (about .243) weighs .20g-.36g generally. Therefore, an airsoft bb has less weight and more surface area. So it's pretty safe to assume that an airsoft bb has a greater drag coefficient. Even if you designed a better bb with less drag, at 1000fps, it would have to be very light to still be safe, and very light means it wont go very far. You just cannot design it so that you have the range while keeping it safe. I hope that makes some sense. To sum it up briefly:
-to get the range, you would need a high velocity and a heavy bb, this would make it very unsafe, as well as classify it as a real firearm
-to make it safe, you would need a low velocity, or a very light bb. Whichever one you choose, you will not get the range
Something to think about though. If it was possible to make a rifled airsoft gun that had range and was safe to play with, it would have been made a long time ago. There is a reason why all the companies have gone with hop up to get range. And yes, I know this thread is all about a rifled airsoft gun, but it is by no means safe to play with.
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