Accuracy question

Dear CCLers,
 Based on my short investigation I could learn that HF/6-31G* is the most
 method for electrostatic parameter optimization in Amber, Charmm, OPLS and
 perhaps in other prominent force fields with the aim of the description of
 electrostatic potential of protein systems.
 Here I'd like to ask experts in this field. Is it the correct conclusion I
 derived or
 perhaps other quantum-chemistry methods are more popular for the purpose of
 electrostatic parameters development, e.g. databases of ESP charges of amino
 or similar.
 Thank you in advance. I will summarise the responses promptly.
 With best regards,
 Victor Anisimov
 FQS Poland, Krakow.