My homemade longbow and my ChekMate Kings Pawn both draw 50 pounds @ 32"and they each like 2216 arrows. I chrono'd them once when I bought the club's chronograph. Had to test it ya know.
Anyway, the 2216's weigh in at 570 grains. That's 11.4 grains per pound. My longbow shoots 'em at 186 fps. The Kings Pawn does 185.
Edit: Added grains per pound for my arrow weight. Just to make everyone happy.
[8D]