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1st: lower pressure round. Smaller parts, less lock friction, slicker action, lower manufacturing cost. 380 is loaded to about 21k psi or less. 9x19 will be 34k.
2nd: Shorter overall cartridge length for a tube magazine. Shorter pump stroke. More rounds in the tube. 6 or 7 + 1 sounds a lot cooler than 4 or 5 + 1.
380 and 32 ACP seem like the 2 most likely choices for this application.
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