I don't have a Ruger, but just recently got a 9.3x62 Zastava. It weighs 7lb 9oz on my fish scale and the 22" barrel is only 0.568" at the muzzle. I haven't shot it yet as waiting on delivery of dies, brass, & bullets....
Interesting...for JB and others who asked, I miked a Ruger African at the LGS today and came up with .560...