Quote:
Originally Posted by OKFC05
Nothing about internal ballistics follows a linear relationship, in spite of urban myths and "common sense." The max pressure increase with increase powder charge is described accurately only by a system of second order partial differential equations (calculus) but can be approximated by an exponential curve for a particular cartridge.
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I think we are talking about two different issues. The number that SAAMI documents is a single pressure and not a time lapse pressure gradient throughout the barrel. Peak pressure rise with the addition of more powder is what I consider linear. Your graph and article refers to a pressure curve over time. As a bullet moves down the barrel, the area behind continues to increase, relieving the pressure and resulting in a lower pressure at the muzzle. I refer only to the maximum instantaneous pressure that will increase at a constant rate as powder charge increases.