There is a chart on the cx website.
I know about the minimum 5 grains per pound of draw weight and i should be shooting a 350 grain arrow but my lightspeeds are 320 grains but my drenalin shoots them well for target shooting and it is dead queit.
On the chart for 76-81#s it list the maxima 350 hunter and coming from your bow it would weigh about 402 grains which would be under the 380 grain minimum