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I suggest either trying one or contacting HKS at HKS Tool Company · Phone 7841 Foundation Dr, Florence, KY 41042 (859) 342-7841
Hi Charles, some information here on this forum >>> https://www.coltforum.com/threads/new-colt-king-cobra-speedloader.369585/ The old King Cobra had a larger diameter cylinder than the new model so the same speed loaders won't work. You need a speed loader for the Colt D-frame…one for the S&W K-frame is pretty close as well. DS speedloader here https://www.budsgunshop.com/product_info.php/products_id/82018/hks+speedloader+for+colt+detective+special+%26+diamondback+rev , I am also reading that the D6 from 5 Star Firearms works with the new King Cobra >>> https://5starfirearms.com/d6-357-38-speed-loader/ Stay safe & have a great day!