Miller, I think you either misstated something or else I'm not understanding. I've never seen a pressure curve that shows pressure increasing at any point down the bore. What does happen is that with some loads, the pressure drops off faster than with others. I can accept that your theoretical 8K load might have decreased less at 4" from the breech, relative to its initial pressure--that is, a pressure curve that does not decline as sharply--compared to the 10K load. But I'd have to see the results of a test in which the pressure increases, say, from the end of the chamber to the 3" point, then begins to decrease again.