Hickory and Pecan are pretty close kin, so they should germinate similarly, I suppose. Several years ago I buried a water line that passed under a pecan tree. A bunch of nuts got buried in the trench as they fell, and I had a nice row of seedlings in the spring. Squirrels bury them a couple inches deep and get a pretty good stand, also.
Maybe you should just toss'em in the ground and see what happens. It seems to depend more on the nut than the soil.