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Old March 20, 2009, 09:44 AM   #3
mykeal
Senior Member
 
Join Date: October 8, 2006
Location: Northern Michigan
Posts: 2,757
tpcollins - you're assuming the sabot/bullet combination starts to move immediately as the gas pressure rises. If that were true the sabot would never expand. Jaguarxk120 has it right: the first thing that happens is the sabot starts to deform as soon as the gas pressure starts to build. The resistance of the malleable plastic sabot to deformation is significantly less than the mass/inertia of the sabot/bullet combination, so the sabot expands first. Once it reaches the limit of expansion as determined by the geometry of the barrel (including the rifling) then the gas pressure begins to move the sabot/bullet.
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