RCBS Case Slick Spray Lube - Testing reveals Case Slick reduces the force needed to resize 308 Winchester cases by 35 to 70 percent when compared to other spray lubes. Reducing the resizing force makes the process easier on you and your brass. Uniform coverage makes resizing a breeze and eliminates the possibility of denting the shoulder of the case. Reduces the force needed to resize 308 Win. cases by 35 to 70 percentFormulated to flow evenly over the surface of the brassEliminates the possibility of denting the case shoulder4 Oz