I have encountered Federal 10ga hulls with a slightly smoother exterior than others I had used, I noticed this a couple of years ago. I have found the smoother hulls have a slightly greater internal capacity requiring a little taller filler to get a proper crimp. I never thought to shine a light in them and look for a difference so this explains something I had encountered. FWIW I have loaded all Federal hulls the same way and never noticed a difference, having shot 1000's. No ill effects to my NH and Remington Damascus 10's. I have not seen any 3.5" 10ga recipes that specify a specific Federal 10ga hull vs. another so my guess is they are considered interchangable. I am just going to keep loading them and shooting them without concern.
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