Phil,
You mean the "stretched" 7x57?
Somehow I ended up with a box of Remington 7x64 ammo in my collection, and like any true rifle loony have had my eye out for a rifle to shoot it in. Ain't going to "build" one, or do a web-search all over the U.S., but if the right one shows up? Who knows.
Always kind of wanted a break-action in 7x65R too, whether kipplauf or drilling. Closest I've come, however, is my drilling in 6.5x57R, which isn't all that close.
of course the streched 7x57 lol... nothing bad really about that original version too ... now if we can talk about the modern cousin te 7-08 ...
