A 2 blade head will penitrate better than a 3 blade head will penitrate better than a 4 blade head .

A cut on contact head will penitrate better than a trocar tip , unless it curls .

What elkcrazy said is very true allso a steep angle [short] head has a harder time penitrateing than a longer gradule angle blade.

A smaller diamiter arrow will make a big diferance in penitration allso , compared to a 24-25 series arrow .

Knowing those things a 2 blade cut on contact , like magnus stinger , or steelfource are great for penitration with lower ke bows , useing a small diamiter arrow shaft and you will have , the best penitrateing arrow posable .

2 holes [a passthru] are allways better than one with an arrow stuck in it , make tracking easyer , putting the arrow in the right spot is a given.