I know they exist.....just curious why the 5.6x57 isn't more popular. The old Lee Navy is basically a 7x57mm with a semi-rim. Same capacity and shape.

5.6x57, 6mm Remington, .257 Roberts, 6.5x57, and 7x57 are a family type round. Guess you could actually add the 8x57, 9x57 and 9.3x57 (an overlooked, but great round) as well.

I hate change, it's never for the better.... Grumpy Old Men
The more I learn, the more I realize how little I know