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A shotgun chamber does not have a square shoulder where the chamber ends. Instead, it has a tapered "forcing cone" that gradually changes from chamber diameter to bore diameter. The shot charge makes that small jump from the case mouth to the tapered forcing cone just fine.

For something to ponder along a similar line, consider the Cutts Compensator where the shot charge makes a jump from the bore through several inches of open space in the compensator, before entereing the choke. It looks like it should just rip everything off the end of the barrel when it hits that choke. But, it doesn't. It also works just fine.
 
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