A paintball carries some 3 joules at the muzzle, and retains alot of it until impact.
Alot of that energy is dispersed when the paintball breaks (inelastic collision).
Paintballs still hurt quite a bit. Think about how much more they hurt when they bounce.
A solid pellet carrying 2.5 joules that will collide elastically with a person is going to hurt like hell, plus at only 6mm diameter, there's a much smaller surface area, which means all that force isn't going to be distributed as much.
So that one small area where it hits is going to be getting pounded.
I don't think you can achieve "accuracy at long range with a standard trajectory", and "can still safely shoot each other with it".
These two worlds seem unwilling to collide.
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