I wear full camo. Lay down looking up thru the tree limbs. with several trees around. I use #4 3" mags. shoot when they circle. I use a FoxPro dying crow sound. Shut it off when you see them coming, about 1,000 yards out. If one comes swooping down, he has to be shot. If you miss, he will tell the others and they will all be gone. If you hit him, the rest will continue to circle. Go about a 1/4 mile away, do same thing, but use a young hurt crow sound. Same crows will come back.
Killed many this way, when eating my sweetcorn.