Hello Jstone
Im my testing, no, painting the bullet tips does not effect accuracy.
My testing was with 22-250, 223, 308, 25-06
Just a side note, our military has been doing this very thing for decades, many 223 ammo 7.62 (308)
50 BMG military bullets are painted to Identify the round as armor piercing , tracer, incendiary, etc.
Now getting paint on the rifling may cause an accuracy problem, and i took that into consideration when i designed my bullet painting Fixtures, the painted bullet surface stops short of the full diameter of the bullet therefore no paint contacts the rifling
I know many people actually powder coat thier pistol bullets, the whole bullet and shoot them.
But i have no experience with that, but personally I don't like the idea of any foreign substance contacting my rifling
I appreciate the qeustion.
Thank you David