Not many companies make strictly .356 bullets for the 380. Sierra and Hornady make .355 bullets for the 380 and 9mm. Speer's 380 bullets are marked .355. Only Remington and Winchester that I'm aware of make their 380 bullets at .356.
SAAMI specs for 380 bullets are 0.3565 - 0.006. So any bullet within .3505 and .3565 is within spec.
The 9mm and 380 Auto have the same barrel specs, which are 0.355" groove diameter. Interchanging bullets is no big deal.
Not without a lot of slop they dont. Thete is quite a bit of space between the back of the magazine and the nose of the bullet. For me personally a pretty hard thing to over look. But plenty of YouTube videos of guys saying "tgey almost made a grave mistake " by loading a .380 in their 9mm.
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