I don't think ptrs penals overshoot. At least have not seen a single overshot with a penal squad, while could with Guards, but it was definitely not 'hit mostly everytime' type of situation. And the amount of damage and penetration ptrs has at far range is hardly enough to be a problem. Zooks and shreks weren't a problem, then why ptrs' are?
I don't believe that PTRS are able to miss vehicles at all... except perhaps a max range Kubelwagen?