The styrafoam would melt, and cover the barrel with melted goey plastic that would harden and made the gun unusable, or worse, cause a hangfire <BAD MOJO!> styrafoam also can burn, imagine fire touching those charge bags? Another case for BAD MOJO!
Paper Mache, it would be blown to pieces, or burn up and you would not get the tightness in the bore, which would cause the round to wobble as it left the bore which would result in a "IRRADIC ROUND!" this is another case for BAD MOJO! When you have such casses the whole crew shouts, screams, waves their arms and does a monty python reinactement of "RUN AWAY! RUN AWAY!" because that round is going someone other than where you intended it to go, and it is going to go much shorter too.
Granted, an 81mm round down the pipe of an 82mm no biggie but when its a 60mm down an 82, and its sabot was bad well that as I put it in my Spanish class, "muy malo....muy muy malo."
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"God bless America, the land of the free, but only so long as it remains the home of the brave."
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