Before resin came into being, standard fingertip drilling was 3/8 palm and 3/8 reverse on the thumb, I have drilled as much as 1 in away and 1 in palm. a couple of people I drilled for had there pitchs 1 in reverse and 1 in palm.
 The first time I saw away pitch was from a now retired PBA player, who drilled his thumbs 1 in away and 1 in reverse.