http://www.thefirearmblog.com/blog/2011 ... 5mm-rifle/
The KBP VKS is technically chambered for the same 12.7x55mm cartridge cases as the ASh-12, but loaded rounds are considerably different. The Ash-12 is 12.7x55mm cartridges are loaded with (relatively) light bullets, much like the .50 Beowulf and the ancient .50-70 Government. The VKS is loaded with very long and very heavy bullets, so much longer that I doubt they would function in an ASh-12. The bullets weigh up to 1170 grain! - See more at: http://www.thefirearmblog.com/blog/2011 ... zseFX.dpuf