Quote:
Originally Posted by BC38
Can you elaborate on this? Seems to me increasing pressure would pretty much have to correlate to increasing velocity - and vice versa. How could it not?
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The non-linearity of increased pressure with increased powder charges means that, depending on the specific powder and where you are on the loading curve for that cartridge, sometimes a very small increase in powder makes a HUGE increase in pressure. At a different point on the pressure curve, even a grain increase may still be well within limits.
Look at it this way. If you are standing on a mild slope and take a step, you are still safe. Take that step next to a cliff and you fall. You can see the curves in the earth, but you only "see" the pressure curves in a cartridge with an instrumented pressure barrel.
Most people not specifically trained have trouble visualizing non-linear rellationships, but your hearing works the same way, on a logarithmic scale of power to the loudness you perceive. Every 3 dB added sound is DOUBLE the power.