gobbleblaster

I dont know what grain of arrow to get, my bow is set a 63lbs, i know you probably need for info so ask because i dont know what you need to help me.

bigbulls

Draw length, brand and spine (the number on the shaft) of arrow, length of arrow, feathers or vanes.

Kanga

Dont drop below 5 grs per pound of draw weight.

63lb = 315gr arrow.

If you want more KE and momentiumthen go with a heavier arrow say around 420 to 450 gr's

SlipperyJack

Ausie-guy is right on. Most bow manufacturers will void the warranty if you shoot an arrow lighter than 5 grains per pound of draw weight. It is similar to a dry-fire in that the bow has to absorb more of the energy upon release with a lighter arrow. For this same reason, a bow shooting a heavier arrow is quiter because less energy is dissipated in the limbs, string, and riser.
In my state, WA, they have put a 6 grain per pound of draw weight minimum for hunting arrows. Most states just have a minimum draw weight though.