I should have mentioned that I am over the 6 gr per pound but the chart reccomends about 5.6 for me.
I have shot 100's and 100's of thousands of arrows around 5 gr per pound for competition and have NEVER had a bow fail.Of course I do shoot Hoyts

.Most bows today can easily handle 5 gr per and in some cases a little less.Your draw length and poudage really needs to be considered when considering how much abuse the bow will be put through.If you are shooting a 33" draw and 80 pounds,then imo,if you are shooting 5 grains per,you are a fool but if you are shooting 25" at 50 pounds then 4 gr per pound may be fine for competition and add a little weight for hunting if you see the need.
It's all relative.