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@gbj_tester
ftfy
Using 248mm spokes where the correct length is 248.9mm, they will still be threaded into the nipples at least 3 diameters, i.e. plenty. More thread engagement than that is for adjustment, not increased pull out strength - the shank snaps before the threads shear.
The ball can't hit the nipple, because the spoke and rim get in the way. Since the spoke is quite flexible and will be struck approximately 1 ball radius away from the nipple, most of the ball impact load becomes a tensile load on the spoke anyway, the only way to transfer shear load to the nipple is through the beam stiffness of the spoke.