I've had that happen too.... sitting there when it sounds like a hailstorm of acorns and no deer.......... until I found the white oaks.
I remember 100 or so years ago when my Dad taught me a way to remember which is which "Red man kills his animals with sharp points(pointing to the sharp points on a red oak leaf), White man kills his animals with a blunt bullet"(points to the rounded edges of a white oak leaf)
Then he talked me into tasting each of the acorns[:'(]... both bitter and nasty, but the white was the lesser of the two evils.