With the rise in popularity of the recently available and affordable PSLs that are out there, I have been trying to put as much data behind the ammunition and the weapon as I can.  
I took the time to pull some rounds and weigh the components.  I have heard/read alot about the shoddy nature of any surplus ammo and wanted to find some data to help me make an informed decision.  Anyone is welcome to add information, please try to include as many details as possible.

I will update as I come across different ammo.

Chrony Data
1. Ammo type
2. Time
3. Temp
4. Distance from chrony
5. Shots fired

1. Hungarian 1980 147 gn light ball
2. 11:30
3. 98deg
4. 10 ft from muzzle
5. 10 rounds fired with 1 minute between each shot

2813
2819
2797
2832
2858
2849
2867
2815
2839
2869

Powder: dark grey stick type
46.5
46.3
46.5
46.8
46.6
47.2
47.0

Projectile
146.5
147.1
147.8
147.7
148.1
147.4
147.1

7.62x54r.net has a wealth of info on surplus ammunition.
7.62x54r.net

Russian light ball stats; Bullet weight -147.2 grains, powder- long grain extruded weighing 49.0 grains average per case, 10 round string chronograph- high velocity was 2792 fps., low was 2745 fps. with an average of 2771 fps. 10 feet from the muzzle, temperature was 26 degrees, sunny, no wind, altitude is 4865 feet above sea level.

Russian 7N1 was donated by member TNhawk; Bullet weight- 152.6 grains, powder- long grain extruded weighing 47.4 grains average per case, 10 round string chronograph- high velocity was 2738 fps.. low was 2703 fps. with an average of 2721 fps. Same conditions as above

Bullet base and case on the left is the Russian light ball while the bullet base and case on the right is of the Russian 7N1. There are no special markings on the 7N1 to tip you off that its a better grade of ammunition. In my rifle it does out perform any ammunition I've shot through it.





The loaded round on the left is the Russian Light Ball, the one on the right is the 7N1, again, no real difference between the 2.