Don't forget to "camo" your gun.
You can buy camo adhesive tape to place on the barrel, scope, and stock, at almost any Wally world, Bass Pro, Gander Mountain, etc.
As important as being still is to place yourself into the surrounding vegetation so that you have some behind you, and in front of you, to break up your outline. Your shadow should be falling onto vegetation, also. Keep the sun behind you, so that the quarry (deer, turkey, etc.) will be looking into the sun when looking in your direction.
Artillery lends dignity to what would otherwise be but a vulgar brawl.