I agree with martin, 5gr. /# draw weight. That's a bare minimum regardless of draw weight. The one thing not many people think of is, the more arrow weight you have, (within reason), the more energy that is transferred to the arrow. That means less energy transferred into the bow. Thus, a quieter, longer lasting bow, and better penetration. Looking back on things over the past few years, I think that was a major factor in alot of the limb problems most companies were having. People shooting right at that 5gpi. rating, trying to get the most out of their bows for speed. Well, one day I figured up what my arrows SHOULD weigh according to all the specs, and guess what, they didn't weight what they should have. They came up about 12 gr. light. Still just over the 5gpi mark, but too light for my liking. I try to shoot something at least 45 gr. over the minimum weight for that draw weight. Good compromise between speed, and silence.
2006 Rytera Bullet X 60#---2008 Moab 70#
2008/12 Firecat 60#--- 2010 Warthog 70#
2010/2012 Alien X 65# 2011 Onzas 60 & 70#
2009 Warthog 70#---2009 Firehawk 70#
2010 Strother SR-71 65# & 2012 Strother Rush 65#
I hunt, therefore I eat. lol