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Hi,
I think direct application of the gas laws may be complicated
because the burn of the gun powder is not instantaeous. My impression is
that the burn time is a fair fraction of the time the bullet is in the
barrel. Different gun powders have different burn rates and if one is
using the maximum charge of powder, the speed of the burn can be important
in keeping the gun together. Gun people, just like engine people do not
speak of explosions in the chamber or the cylinder of the engine, but a
controlled burn.
Thanks
roger Haar U of AZ