#Quickload 3.9 manual#
#Quickload 3.9 windows#

There are more considerations concerning the time in milleseconds between the extremes of the muzzle deflection time and direction as related to barrel length that may be measured and calculated. If good grouping is attained at a certian barrel time dwell then one might assume that another load that produces the same barrel time dwell might also produce good groups. The barrel vibration at the muzzle has a direct effect on the direction of travel imparted to the bullet as it leaves the muzzle which in turn determines accuracy and group size.

#Quickload 3.9 windows#

Priced at 152.95, the latest version 3.9 contains all the updates through January, 2018 and is compatible with WINDOWS 2000, XP, VISTA, Windows 7, Winows 8 and Windows 10. One of the reasons that it is desirable to be able to calculate the bullet barrel time is that the speed of sound or the shock wave in a barrel is constant. If you do not yet own QuickLOAD, you can now order the latest Version 3.9 of this unique software. So, for whatever reasons, all of QuickLoads Barrel time measurents start at 10% of the maximum pressure. The Barrel Time or the elapsed time from the 10% max pressure point to the muzzle is 1.86 milliseconds.ДЄs I mentioned before, I am no expert on internal ballistics calculations or measurements, I can only assume that the very begining of the combustion process is difficult to measure or calculate so an arbitrary 10% of max pressure is used as a comparison point for all measurements and calculations. The trace line starts when 10% of the MAXIMUM PRESSURE is reached (Approximately 162 psi) and ends when the bullet exits the muzzle.

Now, if you closely examine the barrel time chart, you will notice that the pressure trace line does not start at zero. 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.

#Quickload 3.9 manual#

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?Д¬heersThe manual just about explains barrel time as good as can be explained but let us break it down a little.ДЄlthough I have a fair knowledge of External ballistics, my knowledge of Internal ballistics needs more study.