Just another vote with the others that recommend sticking with the heavier bullets...95-110g. While I don't have a 6mm, I have several .243's and they drop deer with 100g Nosler Partition's or Ballistic Tips very effectively. I also have had modest success loading 55g Nosler Ballistic Tips for smaller game. My daughter (7 years old) and my niece (11 years old) both hunt with .243's and do very well with them.