No, not really. Ken Waters developed what he called the .263 Express in the late 1950s. Same cartridge, different name.
JB, A gunsmith near Jonesborough named Herb Reilly worked with Jim in reinventing the .263 Express just prior to the introduction of the .260 Remington. I used to drive the 175 miles just to get Herb to work on my rifles. Sadly, he passed from cancer.
