SL1
Just curious. Did you overlook my statement in my first post on this subject? Where I stated:
Quote:
pV=nRT
where
p is the absolute pressure [Pa],
V is the volume [m3] of the vessel containing the moles of gas, here it is the volume you allow in the shell case, determined by how deep the bullet is seated
n is the amount of substance of gas [mol], here it is in solid form as powder
R is the gas constant [8.314 472 m3•Pa•K−1•mol−1],
T is the temperature in kelvin [K].
This is a gross oversimplification, because as the bullet moves down the barrel, the volume and pressure are constantly changing.
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There was no attempt to predict pressures, only show in very simple mathmatical terms, why the powder charge is lowered for heavier weight bullets.
If as you say:
Quote:
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The main reason that the prefect gas law doesn't work here is - - -
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Then pray tell, what laws are used to compute this?????
If it is not a complex form of the pV=nRT; taking into accout the changing pressures and changing volumes and changing amounts of gas at changing temperatures???? What is the basic formula that is used??????