The barrel time chart shows that the maximum pressure is reached in approximately 6.6 milliseconds. Time is measured in milliseconds or one seecond divided by one thousand ( 1 / 1,000 ) The bullet exits the muzzle with a velocity of 1,602 feet per second and the maximum pressure of the burning powder in the barrel reaches 16,282 pounds per square inch. We can use the calculations for a 20 inch 30-30 barrel, firing a 170 grain Ranch Dog bullet ahead of 25.3 grains of IMR 4895. For what it is worth, this is my understanding of the barrel time feature. In Quickload could a smarter person than me explain from Quickload "Barrel time, 10% Pmax to Muzzle" in the manual it states, Time between instant chamber pressure first reaches 10% of Pmax(maximum pressure) and the instant bullet base passes muzzle?ĬheersThe manual just about explains barrel time as good as can be explained but let us break it down a little.Īlthough I have a fair knowledge of External ballistics, my knowledge of Internal ballistics needs more study.
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