At the Carabanchel Proving Ground in Madrid they use to test bulletproof vests, helmets and armor against some cartridges from the former eastern bloc: 7,62 x 54R, 7,62 x 39 and 5,45 x 39.
Well, it seems that the Naval Air Warfare Center at China Lake in the US does the same. They have even written a report on how they deal with the erratic velocities they are getting with the 7,62 x 54R Armor Piercing Incendiary round from factory No. 17.
The report is titled NAWCWD TM 8598, Temperature Compensated Loading Curves for the 7.62 x 54R Armor Piercing Incendiary (API) Round, by J. Hardy Tyson, Combat Survivability Division Research and Engineering Sciences Department, Naval Air Warfare Center, China Lake, october 2009.