Lawyer Daggit--Cain't say as I've ever shot or even seen a 7x57. Would be happy to try one, but as I'm currently involved with load development in .357 magnum, .45ACP (the newest ctg. for me), 8x57mmJS, .300WSM, .243Win, 7.62x39, and .30-'06, my plate is kinda full for a brand-new rifle/cartridge @ the moment. Oh, forgot .50 cal. blackpowder.
While we're at it, I'd love to try one of Wildalaska's pet 6.5mm Swedes. But there again, I ain't gonna have one myself any time soon.
Come to think about it, at the range, I will gleefully shoot anybody's anything, just for the experience of it.
And of course, if I woke up and found a 7x57 in bed with me, I wouldn't kick it out...
Let's face it: I'm a hopeless case. Will be trying new guns/loads as long as I'm on the green side of the sod.