[quote=“JohnMoss”]Your cartridges are the 14.5 by 114m/m Russian, also known as 14.5m/m KPV and other designations. The links are probably for the 14.5m/m KPV machine gun designed by Vladimirov and adopted in the USSR in 1949, and China, as 14.5m/m Type 56, in 1956.
With your stated bullet diameter of 14.9 m/m, it cannot be the 12.7 Russian machine gun cartridge, in my opinion.
There were aqlso two anti-tank rifles for this cartridge, the PTRD 41 and the PTRS 41. I really cannot define the differences between the two. There may have been other weapons for it. My familiarity with military weapons above .50 caliber, other than infantry crew-served weapons of the American Army during the era I served, is poor. My interest has always been in small-arms, as generally defined by the American military (.50 and under).
Your cartridge cases were made at Arsenal 3, which is the Ulyanovsk Machinery Plant, founded at Ulyanovaak, Russia, in 1931. The headstamp does not tell us who manufactured the complete dummy cartridge. However, my specimen of this dummy round is headstamped " * 3 * 65 and is a brass-washed steel case. The fact that both yours and my own round, the only one I have other than DDR dummy rounds in my DDR collection, are from Ulyanovsk may be an indication that the were the plant, or one of the plants, assigned to make dummy rounds in this caliber. Conjecture only on my part, of course.[/quote]
I agree with your identification of the calibre of the dummy cartridge but that is not a Soviet KPV/Chinese Type 56 belt. The KPV/56 uses a closed pocket belt in which the rounds have to be pulled out to the rear. These links resemble the belts for the 12.7x108mm DShK and NSV guns.