Interesting Russian guns(pics)

First one is 7.62x53R - typo or a different round ? ...

The 7.62x54R ("R" for rimmed) was adopted by the Russian Army in 1891 in the Moisin-Nagant infantry rifle, and was used in both World Wars and the Korean War. This cartridge is also referred to as the 7.62x53R when chambered in Finnish rifles. Russian 7.62x54R rifles commonly have a groove diameter of .312" and therefore use what we call .303 caliber bullets, while Finnish rifles have a groove diameter of .308" and take standard .30 caliber bullets.
http://www.chuckhawks.com/30Russian.htm
 
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