Perhaps one reason: the 9mm uses a very fast twist rate. Lugers use 1:8. .357 around 1:15, 38 special around 1: 18. 45ACP 1:16. Even the LP.08 is 1:8. I recall one of the parts places was selling long luger barrels, but everyone found that they couldn't hit squat with them. The twist rate was 1:16.
FN
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