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Though I might share.
I did the calculatios of barrel length and starting pressure.
Very interesting litte math exercise.
I could plot the velocity of the bb as it travels down the barrel and the drop in pressure. I could also find the time it takes to clear the barrel (ie, if someone wants to investigate the suck back theory).
I could also find the difference in barrel diameter and if I had a chrony I could calculate fricton and back force exerted by the air before the bb through empirical methods.
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