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The bullet have two rings on it, since the barrel will be rifled, the contact area with the barrel have to be small, so the rifling can notch the bullet's surface and get a grip, i didn't exactly get what you meant with thinner rear skirt, you mean it should have larger diameter than the front ring, so it seals the air?
Problem with weight is, when the bullet shape is good enough, you don't need much weight to store the energy, 0.4 would mean slower bullet, longer flight time, and more chance for the wind to effect the bullet.
True, these don't get widespread quickly, but do you want them to be widespread? Everyone would snipe that way, most airsoft guns are so mass produced, they lose originality, it would be nice to see someone using totally new on a field.
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