You are publishing a criminal act, be careful. Hawks are Protected by Uncle Sam. It is a Federal Offense to launch anything at or near them. Prison and an big take out of your wallet.This is what I suggest, at least what I plan to do if I had time, to grab a shotgun and shoot at the blasted thing
I have learned that it is easier to care and feed my flock when not in jail.
I have lost birds. Then the Hawks move on. This time of year is the worst.
Free ranging is not free totally, sometimes it comes with a price.