5.6 x 50R
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The 5.6x50R cartridge was developed in Germany for use as a legal hunting round alongside the 5.6 x 50 Magnum. The two cartridges are dimensionally and ballistically identical in all respects, except that the Magnum cartridge is not rimmed.
Typically firing a 50-grain bullet at c.3,400 fps, this cartridge occupies a useful performance niche approximately halfway between the .222 Remington - 3,100 fps - and the 5.6 x 57 - 3,900 fps.
[edit] Specifications
Rim diameter: .378" Overall length (loaded): 59mm Shoulder angle: 23 degrees Loads: 3.24gm (50gr) @ 1050m/s (3413fps) 3.24gm (50gr) @ 1095m/s (3559fps) 3.60gm (55gr) @ 1000m/s (3250fps)
[edit] References
http://www.chuckhawks.com/5-6x50mag.htm