I am sure the Newtonian laws are just fine. :-)
I would theorize that if the base wad becomes loose that upon firing, gases can get behind it. As the gases leave the barrel and pressure dissipates any gases trapped behind the base wad will likely escape a bit slower. And sometimes there might be just enough oomph of gas behind the wad to push it partially down the barrel as the pressure drops off. Just a thought.
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