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They will most likely fall into the cylinder and not be struck by the firing pin or be pushed out properly by the ejector as .380 ACP is a rimless cartridge that headspaces of the case mouth unlike the rimmed .38 Special.
Earl, unfortunately no since the cases for .38 Special are rimmed and head and the .380 rimless. They would not head space on the rimless case as the .38 Special's rimmed case. The .380 case would slip and slide fore and aft as the revolver tilts. Cheers and stay safe!
Earl, sorry but no 380 acp snap caps won't work in a 38 special revolver. Honestly in modern firearms especially revolvers there's no need for snap caps to dry fire unless you want to get use to loading unloading to practice. The only time I use snap caps is for rimfire cartridge's like 22lr because the firing pin hits the chamber and can cause damage. With center fire cartridges like 38 special there's nothing for the firing pin to hit. If interested here's a link to 38 special snap caps buds has in stock and ready to ship. Sorry but hope this helps, link here.................. https://www.budsgunshop.com/product_info.php/products_id/98727/traditions+asc38+snap+caps+.38+special+plastic+w+brass+base+6+pack