Assuming the combustion and the flame front is consistent between shots is consistent and thats a big if, the physical velocity at any given point can be measured, (cutting a barrel at different lengths and chronograph). The bullet velocity would be effected by factors that would change less from one test to the next. The pressure at any point in the barrel is usually a log fitting curve based on data points, either by piezoelectric or extrapolation using differential equations based on flame front velocities. These inputs could have wide swings at the first measurements, between each test, but the extremes would "iron out" after repeated firings.
Last edited by Etoh; 03/06/24.
